Most GA4 setups silently fail: broken sessions, missing ecommerce events, bad consent signals, or misattributed campaigns. This tool runs pre-built SQL diagnostics directly on your BigQuery export, so you can spot and fix the issues before they affect your reporting.
Click “⚡ Update Queries” after entering your project ID and dataset to generate a tailored library of ready-to-run queries, no SQL expertise required.
This tool is also available on GitHub. Need a refresher on GA4 export structure? Review the official export schema.
Identifies sessions with unusually short (<2s) or long (>30min) durations that may indicate bots or tracking issues.
WITH session_data AS (
SELECT
user_pseudo_id,
CAST((SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id') AS INT64) AS ga_session_id,
event_timestamp
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
)
SELECT
CONCAT(user_pseudo_id, '-', CAST(ga_session_id AS STRING)) AS session_id,
user_pseudo_id,
MIN(event_timestamp) AS session_start,
MAX(event_timestamp) AS session_end,
COUNT(*) AS event_count,
ROUND((MAX(event_timestamp) - MIN(event_timestamp)) / 1000000, 2) AS session_duration_seconds
FROM session_data
GROUP BY user_pseudo_id, ga_session_id
HAVING
event_count > 1 AND
(session_duration_seconds < 2 OR session_duration_seconds > 1800)
ORDER BY session_duration_seconds
Flags users with over 100 distinct sessions in a single day, a pattern often associated with non-human activity.
SELECT
user_pseudo_id,
event_date,
COUNT(DISTINCT CONCAT(user_pseudo_id, '-', CAST((SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id') AS STRING))) AS session_count
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY user_pseudo_id, event_date
HAVING session_count > 100
ORDER BY session_count DESC
Detects sessions with only one repeated event name occurring more than 50 times — a typical sign of automation or malfunction.
WITH session_data AS (
SELECT
user_pseudo_id,
event_name,
CAST((SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id') AS INT64) AS ga_session_id
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
),
session_summary AS (
SELECT
user_pseudo_id,
ga_session_id,
CONCAT(user_pseudo_id, '-', CAST(ga_session_id AS STRING)) AS session_id,
COUNT(*) AS total_events,
COUNT(DISTINCT event_name) AS unique_event_names,
ARRAY_AGG(event_name ORDER BY event_name LIMIT 1)[OFFSET(0)] AS repeated_event
FROM session_data
GROUP BY user_pseudo_id, ga_session_id
),
event_counts AS (
SELECT
user_pseudo_id,
ga_session_id,
event_name,
COUNT(*) AS event_name_count
FROM session_data
GROUP BY user_pseudo_id, ga_session_id, event_name
)
SELECT
s.session_id,
s.user_pseudo_id,
s.total_events,
s.unique_event_names,
s.repeated_event,
ec.event_name_count AS repeated_event_count
FROM session_summary s
LEFT JOIN event_counts ec
ON s.user_pseudo_id = ec.user_pseudo_id
AND s.ga_session_id = ec.ga_session_id
AND s.repeated_event = ec.event_name
WHERE s.unique_event_names = 1 AND s.total_events > 50
ORDER BY s.total_events DESC
Finds the most common pages users visited immediately before landing on a 404 error page. Helps identify broken internal links or navigation issues.
WITH page_views AS (
SELECT
user_pseudo_id,
CAST((SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id') AS INT64) AS ga_session_id,
event_timestamp,
(SELECT value.string_value
FROM UNNEST(event_params)
WHERE key = 'page_location') AS page_location
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'page_view'
),
broken_pages AS (
SELECT
user_pseudo_id,
ga_session_id,
event_timestamp AS broken_time,
page_location AS broken_page
FROM page_views
WHERE page_location LIKE '%/404%'
),
valid_pages AS (
SELECT
user_pseudo_id,
ga_session_id,
event_timestamp AS valid_time,
page_location AS previous_page
FROM page_views
WHERE page_location NOT LIKE '%/404%'
)
SELECT
CONCAT(bp.user_pseudo_id, '-', CAST(bp.ga_session_id AS STRING)) AS session_id,
bp.broken_page,
vp.previous_page,
COUNT(*) AS hits
FROM broken_pages bp
JOIN valid_pages vp
ON bp.user_pseudo_id = vp.user_pseudo_id
AND bp.ga_session_id = vp.ga_session_id
AND vp.valid_time < bp.broken_time
WHERE NOT EXISTS (
SELECT 1
FROM valid_pages vp2
WHERE vp2.user_pseudo_id = vp.user_pseudo_id
AND vp2.ga_session_id = vp.ga_session_id
AND vp2.valid_time < bp.broken_time
AND vp2.valid_time > vp.valid_time
)
GROUP BY session_id, bp.broken_page, vp.previous_page
ORDER BY hits DESC
Tracks the daily volume of page views to 404 pages, allowing you to monitor spikes in broken traffic over time.
SELECT
PARSE_DATE('%Y%m%d', event_date) AS date,
COUNT(*) AS hits_404
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`,
UNNEST(event_params) AS event_params
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'page_view'
AND event_params.key = 'page_location'
AND event_params.value.string_value LIKE '%/404%'
GROUP BY date
ORDER BY date
Shows which marketing sources and mediums are driving users to 404 pages, helping isolate issues caused by campaign links.
SELECT
traffic_source.source,
traffic_source.medium,
event_params.value.string_value AS broken_page,
COUNT(*) AS hits
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`,
UNNEST(event_params) AS event_params
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'page_view'
AND event_params.key = 'page_location'
AND event_params.value.string_value LIKE '%/404%'
GROUP BY traffic_source.source, traffic_source.medium, broken_page
ORDER BY hits DESC
Identifies sessions where source or medium values are missing or marked as '(not set)', which can indicate tracking gaps or misconfigured campaign links.
SELECT DISTINCT
traffic_source.source,
traffic_source.medium,
traffic_source.name AS campaign
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND (
traffic_source.medium IS NULL
OR traffic_source.medium = '(not set)'
OR traffic_source.source IS NULL
OR traffic_source.source = '(not set)'
)
Counts the number of unique campaign names, sources, and mediums in your data. A very high count could suggest tag pollution or inconsistent naming conventions.
SELECT
COUNT(DISTINCT traffic_source.name) AS unique_campaigns,
COUNT(DISTINCT traffic_source.source) AS unique_sources,
COUNT(DISTINCT traffic_source.medium) AS unique_mediums
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
Finds sessions that include a gclid parameter (indicating Google Ads traffic) but don't list Google as the source, suggesting broken auto-tagging or incorrect attribution.
SELECT
traffic_source.source,
traffic_source.medium,
(SELECT value.string_value FROM UNNEST(event_params) WHERE key = 'gclid') AS gclid,
COUNT(*) AS sessions
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND (SELECT value.string_value FROM UNNEST(event_params) WHERE key = 'gclid') IS NOT NULL
AND LOWER(traffic_source.source) NOT LIKE '%google%'
GROUP BY traffic_source.source, traffic_source.medium, gclid
ORDER BY sessions DESC
Flags GA4 campaigns that show a drop in performance, using conversion rates over 7 days, 30 days, and week-over-week. Highlights low-performing campaigns even without historical data.
WITH base_events AS (
SELECT
PARSE_DATE('%Y%m%d', _TABLE_SUFFIX) AS event_date,
IFNULL(traffic_source.name, '(not set)') AS campaign,
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
event_name
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE
_TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
),
session_summary AS (
SELECT
campaign,
event_date,
session_id,
COUNTIF(event_name = 'purchase') > 0 AS is_converting_session
FROM base_events
GROUP BY campaign, event_date, session_id
),
campaign_metrics AS (
SELECT
campaign,
-- This week
SUM(IF(event_date BETWEEN DATE_SUB(CURRENT_DATE(), INTERVAL 6 DAY) AND CURRENT_DATE(), 1, 0)) AS sessions_7d,
SUM(IF(event_date BETWEEN DATE_SUB(CURRENT_DATE(), INTERVAL 6 DAY) AND CURRENT_DATE() AND is_converting_session, 1, 0)) AS conversions_7d,
-- Last week
SUM(IF(event_date BETWEEN DATE_SUB(CURRENT_DATE(), INTERVAL 13 DAY) AND DATE_SUB(CURRENT_DATE(), INTERVAL 7 DAY), 1, 0)) AS sessions_last_week,
SUM(IF(event_date BETWEEN DATE_SUB(CURRENT_DATE(), INTERVAL 13 DAY) AND DATE_SUB(CURRENT_DATE(), INTERVAL 7 DAY) AND is_converting_session, 1, 0)) AS conversions_last_week,
-- Rolling 30-day
COUNT(*) AS sessions_30d,
SUM(IF(is_converting_session, 1, 0)) AS conversions_30d
FROM session_summary
GROUP BY campaign
),
global_baseline AS (
SELECT
ROUND(SAFE_DIVIDE(SUM(IF(is_converting_session, 1, 0)), COUNT(*)) * 100, 2) AS global_cr_pct
FROM session_summary
),
final AS (
SELECT
m.campaign,
ROUND(SAFE_DIVIDE(conversions_7d, sessions_7d) * 100, 2) AS cr_7d_pct,
ROUND(SAFE_DIVIDE(conversions_last_week, sessions_last_week) * 100, 2) AS cr_last_week_pct,
ROUND(SAFE_DIVIDE(conversions_30d, sessions_30d) * 100, 2) AS cr_30d_pct,
g.global_cr_pct,
SAFE_DIVIDE(conversions_7d, sessions_7d) < SAFE_DIVIDE(conversions_last_week, sessions_last_week) * 0.8 AS flag_wow_drop,
SAFE_DIVIDE(conversions_7d, sessions_7d) < SAFE_DIVIDE(conversions_30d, sessions_30d) * 0.7 AS flag_rolling_avg_under,
SAFE_DIVIDE(conversions_7d, sessions_7d) < (g.global_cr_pct / 100) * 0.5 AS flag_below_global_avg
FROM campaign_metrics m, global_baseline g
)
SELECT *
FROM final
ORDER BY flag_wow_drop DESC, flag_rolling_avg_under DESC, flag_below_global_avg DESC;
Counts daily sessions where traffic_source.source contains 'chatgpt', helping you track AI‑driven traffic trends over time.
WITH sessions AS (
SELECT
CAST(
(SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
LIMIT 1
) AS INT64
) AS ga_session_id,
DATE(TIMESTAMP_MICROS(MIN(event_timestamp))) AS session_date
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE
LOWER(traffic_source.source) LIKE '%chatgpt%'
AND _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY
ga_session_id
)
SELECT
session_date,
COUNT(*) AS sessions_count
FROM
sessions
GROUP BY
session_date
ORDER BY
session_date DESC;
Lists the top page_referrer values from session_start events, helping you identify self-referrals or misconfigured sources over the selected date range.
SELECT
ep.value.string_value AS page_referrer,
COUNT(*) AS session_start_count
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`,
UNNEST(event_params) AS ep
WHERE
_TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'session_start'
AND ep.key = 'page_referrer'
GROUP BY
page_referrer
ORDER BY
session_start_count DESC;
This query compares the volume of sessions by consent status (ad_storage / analytics_storage) with the number of purchases in each group. It also highlights completely anonymous pings with no user or session identifiers—often resulting from users declining consent or browser limitations.
WITH all_events AS (
SELECT
user_pseudo_id,
CAST((SELECT value.int_value FROM UNNEST(event_params) WHERE key = 'ga_session_id') AS INT64) AS ga_session_id,
event_name,
privacy_info.analytics_storage AS analytics_storage,
privacy_info.ads_storage AS ads_storage,
privacy_info.uses_transient_token AS uses_transient_token,
ecommerce.transaction_id
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
),
sessions_with_consent AS (
SELECT DISTINCT
user_pseudo_id,
ga_session_id,
CONCAT(user_pseudo_id, '-', CAST(ga_session_id AS STRING)) AS session_id,
MAX(analytics_storage) AS analytics_storage,
MAX(ads_storage) AS ads_storage
FROM all_events
WHERE user_pseudo_id IS NOT NULL AND ga_session_id IS NOT NULL
GROUP BY user_pseudo_id, ga_session_id
),
transient_token_summary AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST(ga_session_id AS STRING)) AS session_id,
MAX(uses_transient_token = 'Yes') AS transient_token_yes
FROM all_events
WHERE user_pseudo_id IS NOT NULL AND ga_session_id IS NOT NULL
GROUP BY session_id
),
purchases AS (
SELECT DISTINCT
CONCAT(user_pseudo_id, '-', CAST((SELECT value.int_value FROM UNNEST(event_params) WHERE key = 'ga_session_id') AS STRING)) AS session_id,
ecommerce.transaction_id
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'purchase'
AND ecommerce.transaction_id IS NOT NULL
),
session_summary AS (
SELECT
CASE
WHEN s.analytics_storage = 'Yes' OR s.ads_storage = 'Yes' THEN 'known_consent_sessions'
ELSE 'unknown_consent_sessions'
END AS session_type,
CASE
WHEN s.analytics_storage = 'Yes' THEN TRUE
WHEN s.analytics_storage IS NULL THEN NULL
ELSE FALSE
END AS analytics_storage_yes,
CASE
WHEN s.ads_storage = 'Yes' THEN TRUE
WHEN s.ads_storage IS NULL THEN NULL
ELSE FALSE
END AS ads_storage_yes,
IFNULL(t.transient_token_yes, FALSE) AS transient_token_yes,
COUNT(DISTINCT s.session_id) AS total_sessions,
COUNT(DISTINCT CASE WHEN p.session_id IS NOT NULL THEN s.session_id END) AS purchase_sessions,
COUNT(DISTINCT p.transaction_id) AS total_purchases,
0 AS total_events
FROM sessions_with_consent s
LEFT JOIN purchases p ON s.session_id = p.session_id
LEFT JOIN transient_token_summary t ON s.session_id = t.session_id
GROUP BY session_type, analytics_storage_yes, ads_storage_yes, transient_token_yes
),
no_session_purchases AS (
SELECT
'no_session_info' AS session_type,
CAST(NULL AS BOOL) AS analytics_storage_yes,
CAST(NULL AS BOOL) AS ads_storage_yes,
CAST(NULL AS BOOL) AS transient_token_yes,
0 AS total_sessions,
0 AS purchase_sessions,
COUNT(DISTINCT p.transaction_id) AS total_purchases,
0 AS total_events
FROM purchases p
WHERE p.session_id IS NULL
),
cookieless_summary AS (
SELECT
CASE
WHEN event_name = 'session_start' THEN 'cookieless_pings_session_start'
ELSE 'cookieless_pings_other'
END AS session_type,
CAST(NULL AS BOOL) AS analytics_storage_yes,
CAST(NULL AS BOOL) AS ads_storage_yes,
CAST(NULL AS BOOL) AS transient_token_yes,
0 AS total_sessions,
0 AS purchase_sessions,
0 AS total_purchases,
COUNT(*) AS total_events
FROM all_events
WHERE user_pseudo_id IS NULL AND ga_session_id IS NULL
GROUP BY session_type
),
event_counts AS (
SELECT
CASE
WHEN user_pseudo_id IS NULL AND ga_session_id IS NULL THEN 'cookieless_pings'
WHEN analytics_storage = 'Yes' OR ads_storage = 'Yes' THEN 'known_consent_sessions'
ELSE 'unknown_consent_sessions'
END AS session_type,
CASE
WHEN analytics_storage = 'Yes' THEN TRUE
WHEN analytics_storage IS NULL THEN NULL
ELSE FALSE
END AS analytics_storage_yes,
CASE
WHEN ads_storage = 'Yes' THEN TRUE
WHEN ads_storage IS NULL THEN NULL
ELSE FALSE
END AS ads_storage_yes,
COUNT(*) AS total_events
FROM all_events
GROUP BY session_type, analytics_storage_yes, ads_storage_yes
),
final_summary AS (
SELECT
ss.session_type,
ss.analytics_storage_yes,
ss.ads_storage_yes,
ss.transient_token_yes,
COALESCE(ec.total_events, 0) AS total_events,
ss.total_sessions,
ss.purchase_sessions,
ss.total_purchases
FROM session_summary ss
LEFT JOIN event_counts ec
USING (session_type, analytics_storage_yes, ads_storage_yes)
UNION ALL
SELECT
session_type,
analytics_storage_yes,
ads_storage_yes,
transient_token_yes,
total_events,
total_sessions,
purchase_sessions,
total_purchases
FROM no_session_purchases
UNION ALL
SELECT
session_type,
analytics_storage_yes,
ads_storage_yes,
transient_token_yes,
total_events,
total_sessions,
purchase_sessions,
total_purchases
FROM cookieless_summary
)
SELECT * FROM final_summary
ORDER BY total_sessions DESC;
Extracts all page_view events where any parameter key is a common PII name (email, phone, etc.) or the value matches an email pattern.
-- PII in event_params
SELECT
event_timestamp,
user_pseudo_id,
(SELECT value.string_value
FROM UNNEST(event_params)
WHERE key = 'page_location'
) AS page_location,
ep.key AS param_key,
ep.value.string_value AS param_value,
CASE
WHEN LOWER(ep.key) IN ('email', 'phone', 'name', 'address') THEN 'PII in param_key'
WHEN REGEXP_CONTAINS(ep.value.string_value, r'[\w\.-]+@[\w\.-]+\.\w+') THEN 'PII in param_value (email)'
WHEN REGEXP_CONTAINS(ep.value.string_value, r'\b[A-Z]{1,2}[0-9]{1,2}[A-Z]?[ +][0-9][A-Z]{2}\b') THEN 'PII in param_value (postcode)'
END AS pii_source
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`,
UNNEST(event_params) AS ep
WHERE
event_name = 'page_view'
AND _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND (
LOWER(ep.key) IN ('email', 'phone', 'name', 'address')
OR REGEXP_CONTAINS(ep.value.string_value, r'[\w\.-]+@[\w\.-]+\.\w+')
OR REGEXP_CONTAINS(ep.value.string_value, r'\b[A-Z]{1,2}[0-9]{1,2}[A-Z]?[ +][0-9][A-Z]{2}\b')
)
UNION ALL
-- PII in page_location (email + strict postcode match)
SELECT
event_timestamp,
user_pseudo_id,
(SELECT value.string_value
FROM UNNEST(event_params)
WHERE key = 'page_location'
) AS page_location,
NULL AS param_key,
NULL AS param_value,
'PII in page_location' AS pii_source
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE
event_name = 'page_view'
AND _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND EXISTS (
SELECT 1
FROM UNNEST(event_params) ep
WHERE ep.key = 'page_location'
AND (
REGEXP_CONTAINS(ep.value.string_value, r'[\w\.-]+@[\w\.-]+\.\w+') -- email
OR REGEXP_CONTAINS(ep.value.string_value, r'\b[A-Z]{1,2}[0-9]{1,2}[A-Z]?[ +][0-9][A-Z]{2}\b') -- postcode
)
)
LIMIT 1000;
Identifies events with a high average number of parameters, which may cause row bloat, higher processing costs, or tracking inefficiencies. Useful for flagging events that may be over-engineered.
SELECT
event_name,
ROUND(AVG(param_count), 2) AS avg_params,
MAX(param_count) AS max_params,
COUNT(*) AS total_events
FROM (
SELECT
event_name,
ARRAY_LENGTH(event_params) AS param_count
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
)
GROUP BY event_name
HAVING avg_params > 10
ORDER BY avg_params DESC
Returns the most frequent non-standard GA4 events, excluding built-in ones like page_view or session_start. Helps you review your most active custom tracking points.
SELECT
event_name,
COUNT(*) AS event_count
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name NOT IN (
'page_view', 'session_start', 'user_engagement',
'scroll', 'click', 'view_search_results',
'purchase', 'add_to_cart', 'begin_checkout'
)
GROUP BY event_name
ORDER BY event_count DESC
LIMIT 20
Audits key eCommerce events like purchase, add_to_cart, etc., for missing or invalid required parameters. It also checks if items arrays are missing entirely from purchase events.
WITH ecommerce_events AS (
SELECT
event_name,
items.item_id,
items.item_name,
items.item_brand,
items.item_variant,
items.item_category,
items.price_in_usd,
items.price,
items.quantity,
items.item_revenue_in_usd,
items.item_revenue,
items.item_refund_in_usd,
items.item_refund,
ecommerce.transaction_id
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`,
UNNEST(items) AS items
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name IN (
'add_to_cart', 'remove_from_cart', 'view_item',
'begin_checkout', 'add_payment_info',
'purchase', 'refund'
)
),
enhanced_ecommerce_audit AS (
SELECT
event_name,
param_key,
COUNT(*) AS total_events,
COUNTIF(
(param_key IN ('item_id', 'item_name', 'item_brand', 'item_variant', 'item_category', 'transaction_id')
AND param_type = 'STRING' AND (string_value IS NULL OR string_value = ''))
OR (param_key IN ('price_in_usd', 'price', 'item_revenue_in_usd', 'item_revenue', 'item_refund_in_usd', 'item_refund')
AND param_type = 'FLOAT64' AND float_value IS NULL)
OR (param_key = 'quantity' AND param_type = 'INTEGER' AND float_value IS NULL
AND event_name IN ('purchase', 'add_to_cart', 'remove_from_cart'))
OR (param_key = 'quantity' AND param_type = 'INTEGER' AND event_name = 'refund'
AND (float_value IS NULL OR float_value >= 0))
OR (param_key IN ('item_revenue_in_usd', 'item_revenue')
AND param_type = 'FLOAT64' AND event_name != 'purchase' AND float_value IS NOT NULL)
OR (param_key IN ('item_refund_in_usd', 'item_refund')
AND param_type = 'FLOAT64' AND event_name != 'refund' AND float_value IS NOT NULL)
) AS missing_or_invalid_count
FROM ecommerce_events,
UNNEST([
STRUCT('item_id' AS param_key, 'STRING' AS param_type, item_id AS string_value, CAST(NULL AS FLOAT64) AS float_value),
STRUCT('item_name' AS param_key, 'STRING' AS param_type, item_name AS string_value, CAST(NULL AS FLOAT64) AS float_value),
STRUCT('item_brand' AS param_key, 'STRING' AS param_type, item_brand AS string_value, CAST(NULL AS FLOAT64) AS float_value),
STRUCT('item_variant' AS param_key, 'STRING' AS param_type, item_variant AS string_value, CAST(NULL AS FLOAT64) AS float_value),
STRUCT('item_category' AS param_key, 'STRING' AS param_type, item_category AS string_value, CAST(NULL AS FLOAT64) AS float_value),
STRUCT('price_in_usd' AS param_key, 'FLOAT64' AS param_type, CAST(NULL AS STRING) AS string_value, price_in_usd AS float_value),
STRUCT('price' AS param_key, 'FLOAT64' AS param_type, CAST(NULL AS STRING) AS string_value, price AS float_value),
STRUCT('quantity' AS param_key, 'INTEGER' AS param_type, CAST(NULL AS STRING) AS string_value, CAST(quantity AS FLOAT64) AS float_value),
STRUCT('item_revenue_in_usd' AS param_key, 'FLOAT64' AS param_type, CAST(NULL AS STRING) AS string_value, item_revenue_in_usd AS float_value),
STRUCT('item_revenue' AS param_key, 'FLOAT64' AS param_type, CAST(NULL AS STRING) AS string_value, item_revenue AS float_value),
STRUCT('item_refund_in_usd' AS param_key, 'FLOAT64' AS param_type, CAST(NULL AS STRING) AS string_value, item_refund_in_usd AS float_value),
STRUCT('item_refund' AS param_key, 'FLOAT64' AS param_type, CAST(NULL AS STRING) AS string_value, item_refund AS float_value),
STRUCT('transaction_id' AS param_key, 'STRING' AS param_type, transaction_id AS string_value, CAST(NULL AS FLOAT64) AS float_value)
]) AS param
GROUP BY event_name, param_key
),
purchase_events AS (
SELECT
event_name,
ARRAY_LENGTH(items) AS item_count,
ecommerce.purchase_revenue_in_usd,
ecommerce.purchase_revenue,
ecommerce.transaction_id
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'purchase'
),
purchase_quality_checks AS (
SELECT
'purchase' AS event_name,
param_key,
COUNT(*) AS total_events,
COUNTIF(
(param_key = 'items_missing_or_empty' AND (item_count IS NULL OR item_count = 0))
OR (param_key = 'purchase_revenue_in_usd' AND purchase_revenue_in_usd IS NULL)
OR (param_key = 'purchase_revenue' AND purchase_revenue IS NULL)
OR (param_key = 'transaction_id' AND (transaction_id IS NULL OR transaction_id = ''))
) AS missing_or_invalid_count
FROM purchase_events,
UNNEST([
STRUCT('items_missing_or_empty' AS param_key),
STRUCT('purchase_revenue_in_usd' AS param_key),
STRUCT('purchase_revenue' AS param_key),
STRUCT('transaction_id' AS param_key)
]) AS param
GROUP BY event_name, param_key
)
SELECT
event_name,
param_key,
'parameter_check' AS audit_type,
total_events,
missing_or_invalid_count,
ROUND(SAFE_DIVIDE(missing_or_invalid_count, total_events) * 100, 2) AS pct_missing_or_invalid
FROM enhanced_ecommerce_audit
UNION ALL
SELECT
event_name,
param_key,
'purchase_quality_check' AS audit_type,
total_events,
missing_or_invalid_count,
ROUND(SAFE_DIVIDE(missing_or_invalid_count, total_events) * 100, 2)
FROM purchase_quality_checks
ORDER BY event_name, pct_missing_or_invalid DESC
Finds parameters with placeholder, null, or otherwise suspicious values like 'undefined' or 'nan'. Useful for identifying tagging errors or poorly populated fields.
SELECT
event_name,
param.key AS parameter_name,
param.value.string_value AS suspicious_value,
COUNT(*) AS occurrences
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`,
UNNEST(event_params) AS param
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND LOWER(param.value.string_value) IN ('null', 'undefined', 'nan', '')
GROUP BY event_name, parameter_name, suspicious_value
ORDER BY occurrences DESC
Shows session counts, purchases, conversion rate, and traffic share for each device/platform/browser/OS combination. Use it to compare how well different devices convert and which contribute most to your traffic.
WITH sessions AS (
SELECT
user_pseudo_id,
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
platform,
device.web_info.browser AS browser,
device.operating_system AS os,
device.category AS device_type,
COUNTIF(event_name = 'purchase') AS purchases
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY user_pseudo_id, session_id, platform, browser, os, device_type
)
SELECT
platform,
browser,
os,
device_type,
COUNT(*) AS sessions,
SUM(purchases) AS conversions,
ROUND(SAFE_DIVIDE(SUM(purchases), COUNT(*)) * 100, 2) AS conversion_rate,
ROUND(SAFE_DIVIDE(COUNT(*), SUM(COUNT(*)) OVER ()) * 100, 2) AS traffic_share_pct
FROM sessions
GROUP BY platform, browser, os, device_type
ORDER BY traffic_share_pct DESC
Flags unusual or suspicious combinations of browsers and operating systems that don't typically appear together. Helpful for bot detection or debugging client-side implementation errors.
WITH event_device_data AS (
SELECT
device.web_info.browser AS browser,
device.operating_system AS operating_system,
COUNT(*) AS event_count
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY browser, operating_system
),
known_valid_pairs AS (
SELECT 'Chrome' AS browser, 'Windows' AS operating_system UNION ALL
SELECT 'Chrome', 'macOS' UNION ALL
SELECT 'Chrome', 'Android' UNION ALL
SELECT 'Chrome', 'iOS' UNION ALL
SELECT 'Chrome', 'Chrome OS' UNION ALL
SELECT 'Safari', 'iOS' UNION ALL
SELECT 'Safari', 'macOS' UNION ALL
SELECT 'Safari', 'Macintosh' UNION ALL
SELECT 'Safari (in-app)', 'iOS' UNION ALL
SELECT 'Edge', 'Windows' UNION ALL
SELECT 'Firefox', 'Windows' UNION ALL
SELECT 'Firefox', 'macOS' UNION ALL
SELECT 'Samsung Internet', 'Android' UNION ALL
SELECT 'Internet Explorer', 'Windows' UNION ALL
SELECT 'Android Webview', 'Android' UNION ALL
SELECT 'Android Browser', 'Android'
)
SELECT
e.browser,
e.operating_system,
e.event_count,
IF(k.browser IS NULL, '⚠️ Unusual Combination', 'Valid') AS validity
FROM event_device_data e
LEFT JOIN known_valid_pairs k
ON e.browser = k.browser AND e.operating_system = k.operating_system
ORDER BY validity DESC, e.event_count DESC
Identifies transaction IDs that appear in more than one session or on multiple dates — a potential sign of deduplication issues or tracking bugs.
SELECT
ecommerce.transaction_id AS transaction_id,
COUNT(*) AS transaction_count,
COUNT(DISTINCT CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING))) AS unique_sessions,
COUNT(DISTINCT event_date) AS unique_days
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'purchase'
GROUP BY ecommerce.transaction_id
HAVING transaction_count > 1
ORDER BY transaction_count DESC
Compares GA4 revenue values (based on the 'value' parameter in purchase events) against your backend data to identify discrepancies.
SELECT
ga.transaction_id,
ga.ga4_revenue,
backend.revenue AS backend_revenue,
ga.ga4_revenue - backend.revenue AS variance,
ROUND(SAFE_DIVIDE(ga.ga4_revenue - backend.revenue, backend.revenue) * 100, 2) AS variance_pct
FROM (
SELECT
ecommerce.transaction_id AS transaction_id,
SUM(ecommerce.purchase_revenue) AS ga4_revenue
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'purchase'
GROUP BY ecommerce.transaction_id
) ga
JOIN `your_project.your_dataset.backend_transactions` AS backend
ON ga.transaction_id = backend.transaction_id
ORDER BY ABS(variance_pct) DESC
Flags sessions where a purchase occurred but the user did not trigger an add_to_cart or begin_checkout event — often caused by broken funnel instrumentation or third-party integrations.
WITH all_events_with_sessions AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
user_pseudo_id,
event_name
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
),
session_event_counts AS (
SELECT
session_id,
COUNTIF(event_name = 'add_to_cart') AS add_to_cart_count,
COUNTIF(event_name = 'begin_checkout') AS begin_checkout_count,
COUNTIF(event_name = 'purchase') AS purchase_count
FROM all_events_with_sessions
GROUP BY session_id
),
purchasing_sessions AS (
SELECT *
FROM session_event_counts
WHERE purchase_count > 0
)
SELECT
COUNT(*) AS purchasing_sessions,
COUNTIF(add_to_cart_count = 0) AS sessions_with_no_add_to_cart,
COUNTIF(begin_checkout_count = 0) AS sessions_with_no_begin_checkout
FROM purchasing_sessions
Checks for purchase events where the items array is either missing or empty. These transactions will show up in GA4 totals but won’t include product-level data.
SELECT
COUNT(DISTINCT (
SELECT value.string_value FROM UNNEST(event_params)
WHERE key = 'transaction_id'
)) AS transactions_without_items
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'purchase'
AND (items IS NULL OR ARRAY_LENGTH(items) = 0)
Categorises sessions based on the number of events they contain. Useful for identifying sessions that are unusually light or heavy in event activity, which can indicate bots, passive sessions, or broken tracking.
WITH sessions AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
COUNT(*) AS total_events
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY session_id, user_pseudo_id
),
bucketed_sessions AS (
SELECT
CASE
WHEN total_events < 50 THEN '< 50'
WHEN total_events BETWEEN 50 AND 99 THEN '50–99'
WHEN total_events BETWEEN 100 AND 149 THEN '100–149'
ELSE '150+'
END AS event_bracket
FROM sessions
)
SELECT
event_bracket,
COUNT(*) AS session_count
FROM bucketed_sessions
GROUP BY event_bracket
ORDER BY
CASE event_bracket
WHEN '< 50' THEN 1
WHEN '50–99' THEN 2
WHEN '100–149' THEN 3
WHEN '150+' THEN 4
END
Lists the first event triggered in each session and counts how often each event was the first interaction. Helpful for identifying unexpected session entry points or broken landing page logic.
WITH events_with_session_id AS (
SELECT
user_pseudo_id,
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
event_name,
event_timestamp
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
),
first_event_per_session AS (
SELECT
session_id,
event_name AS first_event
FROM (
SELECT
session_id,
event_name,
ROW_NUMBER() OVER (PARTITION BY session_id ORDER BY event_timestamp) AS rn
FROM events_with_session_id
)
WHERE rn = 1
)
SELECT
first_event AS event_name,
COUNT(DISTINCT session_id) AS sessions_starting_with_event
FROM first_event_per_session
GROUP BY first_event
ORDER BY sessions_starting_with_event DESC
Calculates the percentage of sessions that lack key engagement events like user_engagement, scroll, or click, and only have one or two total events. These may be bounces or sessions from passive users or bots.
WITH sessions AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
ARRAY_AGG(DISTINCT event_name) AS event_list,
COUNT(DISTINCT event_name) AS unique_events
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY session_id
),
summary AS (
SELECT
COUNT(*) AS total_sessions,
COUNTIF(
NOT 'user_engagement' IN UNNEST(event_list)
AND NOT 'scroll' IN UNNEST(event_list)
AND NOT 'click' IN UNNEST(event_list)
AND unique_events <= 2
) AS non_engaged_sessions
FROM sessions
)
SELECT
total_sessions,
non_engaged_sessions,
ROUND(SAFE_DIVIDE(non_engaged_sessions, total_sessions) * 100, 2) AS non_engaged_pct
FROM summary
Analyses sessions with MVT Test events, showing the count of total sessions and sessions with specific conversion events (purchase, generate_lead, sign_up, begin_checkout, add_to_cart) by test code and variant. Helps evaluate the impact of multivariate test variants on user conversions.
WITH MvtEvents AS (
SELECT
event_name,
(SELECT value.string_value
FROM UNNEST(event_params)
WHERE key = 'eventAction') AS eventAction,
(SELECT value.string_value
FROM UNNEST(event_params)
WHERE key = 'eventLabel') AS eventLabel,
CONCAT(
user_pseudo_id,
'-',
CAST(
(SELECT ep.value.int_value
FROM UNNEST(event_params) ep
WHERE ep.key = 'ga_session_id') AS STRING)
) AS session_id
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE event_name = 'MVT Test'
AND _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
),
ConversionSessions AS (
SELECT
CONCAT(
user_pseudo_id,
'-',
CAST(
(SELECT ep.value.int_value
FROM UNNEST(event_params) ep
WHERE ep.key = 'ga_session_id') AS STRING)
) AS session_id,
MAX(CASE WHEN event_name = 'purchase' THEN 1 ELSE 0 END) AS has_purchase,
MAX(CASE WHEN event_name = 'generate_lead' THEN 1 ELSE 0 END) AS has_generate_lead,
MAX(CASE WHEN event_name = 'sign_up' THEN 1 ELSE 0 END) AS has_sign_up,
MAX(CASE WHEN event_name = 'begin_checkout' THEN 1 ELSE 0 END) AS has_begin_checkout,
MAX(CASE WHEN event_name = 'add_to_cart' THEN 1 ELSE 0 END) AS has_add_to_cart
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE event föräld
event_name IN ('purchase', 'generate_lead', 'sign_up', 'begin_checkout', 'add_to_cart')
AND _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY session_id
)
SELECT
m.event_name,
m.eventAction,
m.eventLabel,
COUNT(DISTINCT m.session_id) AS session_count,
COUNT(DISTINCT CASE WHEN c.has_purchase = 1 THEN m.session_id END) AS sessions_with_purchase,
COUNT(DISTINCT CASE WHEN c.has_generate_lead = 1 THEN m.session_id END) AS sessions_with_generate_lead,
COUNT(DISTINCT CASE WHEN c.has_sign_up = 1 THEN m.session_id END) AS sessions_with_sign_up,
COUNT(DISTINCT CASE WHEN c.has_begin_checkout = 1 THEN m.session_id END) AS sessions_with_begin_checkout,
COUNT(DISTINCT CASE WHEN c.has_add_to_cart = 1 THEN m.session_id END) AS sessions_with_add_to_cart,
COUNT(DISTINCT CASE
WHEN c.has_purchase = 1 OR c.has_generate_lead = 1 OR c.has_sign_up = 1
OR c.has_begin_checkout = 1 OR c.has_add_to_cart = 1 THEN m.session_id
END) AS sessions_with_any_conversion
FROM MvtEvents m
LEFT JOIN ConversionSessions c
ON m.session_id = c.session_id
GROUP BY m.event_name, m.eventAction, m.eventLabel
ORDER BY session_count DESC
Compares each MVT Test variant’s conversion rates to the control variant, calculating statistical significance using a two-proportion Z-test. Identifies which variants perform significantly better or worse than the control for each conversion event (purchase, generate_lead, sign_up, begin_checkout, add_to_cart, and any conversion).
WITH MvtEvents AS (
SELECT
event_name,
(SELECT value.string_value FROM UNNEST(event_params) WHERE key = 'eventAction') AS eventAction,
(SELECT value.string_value FROM UNNEST(event_params) WHERE key = 'eventLabel') AS eventLabel,
CONCAT(
user_pseudo_id,
'-',
CAST(
(SELECT ep.value.int_value FROM UNNEST(event_params) ep WHERE ep.key = 'ga_session_id') AS STRING)
) AS session_id
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE event_name = 'MVT Test'
AND _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
),
ConversionSessions AS (
SELECT
CONCAT(
user_pseudo_id,
'-',
CAST(
(SELECT ep.value.int_value FROM UNNEST(event_params) ep WHERE ep.key = 'ga_session_id') AS STRING)
) AS session_id,
MAX(CASE WHEN event_name = 'purchase' THEN 1 ELSE 0 END) AS has_purchase,
MAX(CASE WHEN event_name = 'generate_lead' THEN 1 ELSE 0 END) AS has_generate_lead,
MAX(CASE WHEN event_name = 'sign_up' THEN 1 ELSE 0 END) AS has_sign_up,
MAX(CASE WHEN event_name = 'begin_checkout' THEN 1 ELSE 0 END) AS has_begin_checkout,
MAX(CASE WHEN event_name = 'add_to_cart' THEN 1 ELSE 0 END) AS has_add_to_cart
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE event_name IN ('purchase', 'generate_lead', 'sign_up', 'begin_checkout', 'add_to_cart')
AND _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY session_id
),
BaseMetrics AS (
SELECT
m.event_name,
m.eventAction,
m.eventLabel,
COUNT(DISTINCT m.session_id) AS session_count,
COUNT(DISTINCT CASE WHEN c.has_purchase = 1 THEN m.session_id END) AS sessions_with_purchase,
COUNT(DISTINCT CASE WHEN c.has_generate_lead = 1 THEN m.session_id END) AS sessions_with_generate_lead,
COUNT(DISTINCT CASE WHEN c.has_sign_up = 1 THEN m.session_id END) AS sessions_with_sign_up,
COUNT(DISTINCT CASE WHEN c.has_begin_checkout = 1 THEN m.session_id END) AS sessions_with_begin_checkout,
COUNT(DISTINCT CASE WHEN c.has_add_to_cart = 1 THEN m.session_id END) AS sessions_with_add_to_cart,
COUNT(DISTINCT CASE
WHEN c.has_purchase = 1 OR c.has_generate_lead = 1 OR c.has_sign_up = 1
OR c.has_begin_checkout = 1 OR c.has_add_to_cart = 1 THEN m.session_id
END) AS sessions_with_any_conversion
FROM MvtEvents m
LEFT JOIN ConversionSessions c
ON m.session_id = c.session_id
GROUP BY m.event_name, m.eventAction, m.eventLabel
),
ControlMetrics AS (
SELECT
session_count AS control_session_count,
sessions_with_purchase AS control_sessions_with_purchase,
sessions_with_generate_lead AS control_sessions_with_generate_lead,
sessions_with_sign_up AS control_sessions_with_sign_up,
sessions_with_begin_checkout AS control_sessions_with_begin_checkout,
sessions_with_add_to_cart AS control_sessions_with_add_to_cart,
sessions_with_any_conversion AS control_sessions_with_any_conversion
FROM BaseMetrics
WHERE eventLabel LIKE '%control%'
LIMIT 1
),
SignificanceTests AS (
SELECT
b.event_name,
b.eventAction,
b.eventLabel,
b.session_count,
b.sessions_with_purchase,
b.sessions_with_generate_lead,
b.sessions_with_sign_up,
b.sessions_with_begin_checkout,
b.sessions_with_add_to_cart,
b.sessions_with_any_conversion,
b.sessions_with_purchase / b.session_count AS purchase_conversion_rate,
c.control_sessions_with_purchase / c.control_session_count AS control_purchase_conversion_rate,
CASE
WHEN b.session_count > 0 AND c.control_session_count > 0 THEN
1 - NORM.DIST(
ABS(
(b.sessions_with_purchase / b.session_count - c.control_sessions_with_purchase / c.control_session_count) /
SQRT(
(b.sessions_with_purchase / b.session_count * (1 - b.sessions_with_purchase / b.session_count) / b.session_count) +
(c.control_sessions_with_purchase / c.control_session_count * (1 - c.control_sessions_with_purchase / c.control_session_count) / c.control_session_count)
)
),
0,
1,
TRUE
) * 2
ELSE NULL
END AS purchase_p_value,
b.sessions_with_generate_lead / b.session_count AS generate_lead_conversion_rate,
c.control_sessions_with_generate_lead / c.control_session_count AS control_generate_lead_conversion_rate,
CASE
WHEN b.session_count > 0 AND c.control_session_count > 0 THEN
1 - NORM.DIST(
ABS(
(b.sessions_with_generate_lead / b.session_count - c.control_sessions_with_generate_lead / c.control_session_count) /
SQRT(
(b.sessions_with_generate_lead / b.session_count * (1 - b.sessions_with_generate_lead / b.session_count) / b.session_count) +
(c.control_sessions_with_generate_lead / c.control_session_count * (1 - c.control_sessions_with_generate_lead / c.control_session_count) / c.control_session_count)
)
),
0,
1,
TRUE
) * 2
ELSE NULL
END AS generate_lead_p_value,
b.sessions_with_sign_up / b.session_count AS sign_up_conversion_rate,
c.control_sessions_with_sign_up / c.control_session_count AS control_sign_up_conversion_rate,
CASE
WHEN b.session_count > 0 AND c.control_session_count > 0 THEN
1 - NORM.DIST(
ABS(
(b.sessions_with_sign_up / b.session_count - c.control_sessions_with_sign_up / c.control_session_count) /
SQRT(
(b.sessions_with_sign_up / b.session_count * (1 - b.sessions_with_sign_up / b.session_count) / b.session_count) +
(c.control_sessions_with_sign_up / c.control_session_count * (1 - c.control_sessions_with_sign_up / c.control_session_count) / c.control_session_count)
)
),
0,
1,
TRUE
) * 2
ELSE NULL
END AS sign_up_p_value,
b.sessions_with_begin_checkout / b.session_count AS begin_checkout_conversion_rate,
c.control_sessions_with_begin_checkout / c.control_session_count AS control_begin_checkout_conversion_rate,
CASE
WHEN b.session_count > 0 AND c.control_session_count > 0 THEN
1 - NORM.DIST(
ABS(
(b.sessions_with_begin_checkout / b.session_count - c.control_sessions_with_begin_checkout / c.control_session_count) /
SQRT(
(b.sessions_with_begin_checkout / b.session_count * (1 - b.sessions_with_begin_checkout / b.session_count) / b.session_count) +
(c.control_sessions_with_begin_checkout / c.control_session_count * (1 - c.control_sessions_with_begin_checkout / c.control_session_count) / c.control_session_count)
)
),
0,
1,
TRUE
) * 2
ELSE NULL
END AS begin_checkout_p_value,
b.sessions_with_add_to_cart / b.session_count AS add_to_cart_conversion_rate,
c.control_sessions_with_add_to_cart / c.control_session_count AS control_add_to_cart_conversion_rate,
CASE
WHEN b.session_count > 0 AND c.control_session_count > 0 THEN
1 - NORM.DIST(
ABS(
(b.sessions_with_add_to_cart / b.session_count - c.control_sessions_with_add_to_cart / c.control_session_count) /
SQRT(
(b.sessions_with_add_to_cart / b.session_count * (1 - b.sessions_with_add_to_cart / b.session_count) / b.session_count) +
(c.control_sessions_with_add_to_cart / c.control_session_count * (1 - c.control_sessions_with_add_to_cart / c.control_session_count) / c.control_session_count)
)
),
0,
1,
TRUE
) * 2
ELSE NULL
END AS add_to_cart_p_value,
b.sessions_with_any_conversion / b.session_count AS any_conversion_rate,
c.control_sessions_with_any_conversion / c.control_session_count AS control_any_conversion_rate,
CASE
WHEN b.session_count > 0 AND c.control_session_count > 0 THEN
1 - NORM.DIST(
ABS(
(b.sessions_with_any_conversion / b.session_count - c.control_sessions_with_any_conversion / c.control_session_count) /
SQRT(
(b.sessions_with_any_conversion / b.session_count * (1 - b.sessions_with_any_conversion / b.session_count) / b.session_count) +
(c.control_sessions_with_any_conversion / c.control_session_count * (1 - c.control_sessions_with_any_conversion / c.control_session_count) / c.control_session_count)
)
),
0,
1,
TRUE
) * 2
ELSE NULL
END AS any_conversion_p_value
FROM BaseMetrics b
CROSS JOIN ControlMetrics c
WHERE b.eventLabel NOT LIKE '%control%'
)
SELECT
event_name,
eventAction,
eventLabel,
session_count,
sessions_with_purchase,
purchase_conversion_rate,
control_purchase_conversion_rate,
purchase_p_value,
CASE
WHEN purchase_p_value < 0.05 AND purchase_conversion_rate > control_purchase_conversion_rate THEN 'Significantly Better'
WHEN purchase_p_value < 0.05 AND purchase_conversion_rate < control_purchase_conversion_rate THEN 'Significantly Worse'
ELSE 'Not Significant'
END AS purchase_significance,
sessions_with_generate_lead,
generate_lead_conversion_rate,
control_generate_lead_conversion_rate,
generate_lead_p_value,
CASE
WHEN generate_lead_p_value < 0.05 AND generate_lead_conversion_rate > control_generate_lead_conversion_rate THEN 'Significantly Better'
WHEN generate_lead_p_value < 0.05 AND generate_lead_conversion_rate < control_generate_lead_conversion_rate THEN 'Significantly Worse'
ELSE 'Not Significant'
END AS generate_lead_significance,
sessions_with_sign_up,
sign_up_conversion_rate,
control_sign_up_conversion_rate,
sign_up_p_value,
CASE
WHEN sign_up_p_value < 0.05 AND sign_up_conversion_rate > control_sign_up_conversion_rate THEN 'Significantly Better'
WHEN sign_up_p_value < 0.05 AND sign_up_conversion_rate < control_sign_up_conversion_rate THEN 'Significantly Worse'
ELSE 'Not Significant'
END AS sign_up_significance,
sessions_with_begin_checkout,
begin_checkout_conversion_rate,
control_begin_checkout_conversion_rate,
begin_checkout_p_value,
CASE
WHEN begin_checkout_p_value < 0.05 AND begin_checkout_conversion_rate > control_begin_checkout_conversion_rate THEN 'Significantly Better'
WHEN begin_checkout_p_value < 0.05 AND begin_checkout_conversion_rate < control_begin_checkout_conversion_rate THEN 'Significantly Worse'
ELSE 'Not Significant'
END AS begin_checkout_significance,
sessions_with_add_to_cart,
add_to_cart_conversion_rate,
control_add_to_cart_conversion_rate,
add_to_cart_p_value,
CASE
WHEN add_to_cart_p_value < 0.05 AND add_to_cart_conversion_rate > control_add_to_cart_conversion_rate THEN 'Significantly Better'
WHEN add_to_cart_p_value < 0.05 AND add_to_cart_conversion_rate < control_add_to_cart_conversion_rate THEN 'Significantly Worse'
ELSE 'Not Significant'
END AS add_to_cart_significance,
sessions_with_any_conversion,
any_conversion_rate,
control_any_conversion_rate,
any_conversion_p_value,
CASE
WHEN any_conversion_p_value < 0.05 AND any_conversion_rate > control_any_conversion_rate THEN 'Significantly Better'
WHEN any_conversion_p_value < 0.05 AND any_conversion_rate < control_any_conversion_rate THEN 'Significantly Worse'
ELSE 'Not Significant'
END AS any_conversion_significance
FROM SignificanceTests
ORDER BY session_count DESC
Aggregates all years’ data by calendar month to compute average sessions and transactions per month, then derives seasonality multipliers (and conversion‑rate index) rounded to two decimals.
WITH
sessions_per_month_year AS (
SELECT
FORMAT_TIMESTAMP('%Y-%m', TIMESTAMP_MICROS(event_timestamp)) AS month_year,
EXTRACT(MONTH FROM TIMESTAMP_MICROS(event_timestamp)) AS month_num,
FORMAT_TIMESTAMP('%B', TIMESTAMP_MICROS(event_timestamp)) AS month_name,
COUNT(DISTINCT CONCAT(
user_pseudo_id, '-',
CAST((SELECT value.int_value FROM UNNEST(event_params) WHERE key = 'ga_session_id') AS STRING)
)) AS sessions_count
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE
event_name = 'session_start'
AND TIMESTAMP_MICROS(event_timestamp) BETWEEN
TIMESTAMP_SUB(CURRENT_DATE, INTERVAL 365 DAY) AND CURRENT_DATE
GROUP BY month_year, month_num, month_name
),
transactions_per_month_year AS (
SELECT
FORMAT_TIMESTAMP('%Y-%m', TIMESTAMP_MICROS(event_timestamp)) AS month_year,
EXTRACT(MONTH FROM TIMESTAMP_MICROS(event_timestamp)) AS month_num,
FORMAT_TIMESTAMP('%B', TIMESTAMP_MICROS(event_timestamp)) AS month_name,
COUNT(*) AS transactions_count
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE
event_name = 'purchase'
AND TIMESTAMP_MICROS(event_timestamp) BETWEEN
TIMESTAMP_SUB(CURRENT_DATE, INTERVAL 365 DAY) AND CURRENT_DATE
GROUP BY month_year, month_num, month_name
),
combined_month_year AS (
SELECT
s.month_year,
s.month_num,
s.month_name,
s.sessions_count,
COALESCE(t.transactions_count, 0) AS transactions_count
FROM sessions_per_month_year s
LEFT JOIN transactions_per_month_year t
USING(month_year, month_num, month_name)
),
stats AS (
SELECT
COUNT(*) AS months_count,
SAFE_DIVIDE(SUM(sessions_count), COUNT(*)) AS overall_avg_sessions,
SAFE_DIVIDE(SUM(transactions_count), COUNT(*)) AS overall_avg_transactions,
SAFE_DIVIDE(
SUM(transactions_count),
SUM(sessions_count)
) AS overall_avg_conv_rate
FROM combined_month_year
),
agg_by_month AS (
SELECT
month_num,
month_name,
AVG(sessions_count) AS avg_sessions_by_month,
AVG(transactions_count) AS avg_transactions_by_month,
SAFE_DIVIDE(
AVG(transactions_count),
AVG(sessions_count)
) AS avg_conv_rate_by_month
FROM combined_month_year
GROUP BY month_num, month_name
)
SELECT
month_name AS month,
ROUND(
SAFE_DIVIDE(avg_sessions_by_month, stats.overall_avg_sessions),
2
) AS session_seasonality,
ROUND(
SAFE_DIVIDE(avg_transactions_by_month, stats.overall_avg_transactions),
2
) AS transaction_seasonality,
ROUND(
SAFE_DIVIDE(avg_conv_rate_by_month, stats.overall_avg_conv_rate),
2
) AS conversion_rate_seasonality
FROM agg_by_month
CROSS JOIN stats
ORDER BY month_num;
Calculates how often sessions that include each event lead to a purchase. This is useful for identifying which events are most correlated with conversions and can help prioritise key interactions in the funnel.
-- Conversion Propensity by Event
WITH session_purchases AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params) WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
MAX(IF(event_name = 'purchase', 1, 0)) AS converted
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY session_id
),
event_in_sessions AS (
SELECT
event_name,
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params) WHERE key = 'ga_session_id'
) AS STRING)) AS session_id
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
),
event_conversion_propensity AS (
SELECT
eis.event_name,
COUNTIF(sp.converted = 1) AS conversions,
COUNT(*) AS total_events,
SAFE_DIVIDE(COUNTIF(sp.converted = 1), COUNT(*)) AS conversion_propensity
FROM event_in_sessions eis
JOIN session_purchases sp ON eis.session_id = sp.session_id
GROUP BY eis.event_name
)
SELECT *
FROM event_conversion_propensity
ORDER BY conversion_propensity DESC
Assigns fractional revenue to each event based on the number of events in a session. Helps reveal which events tend to appear in higher-value sessions and gives a proxy for their revenue contribution.
WITH sessions_with_revenue AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params) WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
SUM(ecommerce.purchase_revenue) AS session_revenue
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'purchase'
GROUP BY session_id
),
session_event_counts AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params) WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
COUNT(*) AS event_count
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY session_id
),
events_with_context AS (
SELECT
event_name,
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params) WHERE key = 'ga_session_id'
) AS STRING)) AS session_id
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
),
combined AS (
SELECT
e.event_name,
s.session_revenue,
c.event_count,
SAFE_DIVIDE(s.session_revenue, c.event_count) AS fractional_revenue
FROM events_with_context e
LEFT JOIN sessions_with_revenue s ON e.session_id = s.session_id
LEFT JOIN session_event_counts c ON e.session_id = c.session_id
WHERE s.session_revenue IS NOT NULL AND c.event_count > 0
)
SELECT
event_name,
COUNT(*) AS event_count,
ROUND(SUM(fractional_revenue), 2) AS total_revenue_when_present,
ROUND(SAFE_DIVIDE(SUM(fractional_revenue), COUNT(*)), 2) AS avg_revenue_per_event_instance
FROM combined
GROUP BY event_name
ORDER BY avg_revenue_per_event_instance DESC
Compares how frequently each event appears in purchasing vs non-purchasing sessions. Useful for spotting events that are common in successful user journeys versus those that aren’t contributing to conversions.
-- Event Appearance in Purchase vs Non-Purchase Sessions
WITH session_event_map AS (
SELECT
user_pseudo_id,
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
event_name,
MAX(IF(event_name = 'purchase', 1, 0)) OVER (
PARTITION BY user_pseudo_id, CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING))
) AS purchase_session
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
)
SELECT
event_name,
COUNTIF(purchase_session = 1) AS events_in_purchasing_sessions,
COUNTIF(purchase_session = 0) AS events_in_non_purchasing_sessions,
ROUND(SAFE_DIVIDE(COUNTIF(purchase_session = 1), COUNT(*)), 4) AS purchase_session_ratio
FROM session_event_map
GROUP BY event_name
ORDER BY purchase_session_ratio DESC
Shows landing pages by session count and calculates how many sessions resulted in key conversion events (purchase, lead, sign-up, etc.). Each event is counted once per session. The total conversion count is the sum of all sessions that triggered each event type. Also includes the purchase conversion rate (purchase sessions / total sessions).
-- Landing Page Performance by Conversion Events (Session-Based)
WITH base_events AS (
SELECT
(SELECT ep.value.string_value FROM UNNEST(event_params) ep WHERE ep.key = 'page_location') AS page_location,
CONCAT(
REGEXP_REPLACE(
REGEXP_EXTRACT(
(SELECT ep.value.string_value FROM UNNEST(event_params) ep WHERE ep.key = 'page_location'),
r'https?://[^/]+(/[^?]*)'
),
r'/$',
''
),
'/'
) AS page_path,
CONCAT(user_pseudo_id, '-', CAST(
(SELECT ep.value.int_value FROM UNNEST(event_params) ep WHERE ep.key = 'ga_session_id') AS STRING)) AS full_session_id
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE
_TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'session_start'
),
conversion_events AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST(
(SELECT ep.value.int_value FROM UNNEST(event_params) ep WHERE ep.key = 'ga_session_id') AS STRING)) AS full_session_id,
event_name
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE
_TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name IN ('purchase', 'generate_lead', 'sign_up', 'begin_checkout', 'add_to_cart')
)
SELECT
base.page_path,
base.page_location,
COUNT(DISTINCT base.full_session_id) AS sessions,
COUNT(DISTINCT CASE WHEN conv.event_name = 'purchase' THEN base.full_session_id END) AS purchases,
COUNT(DISTINCT CASE WHEN conv.event_name = 'generate_lead' THEN base.full_session_id END) AS leads,
COUNT(DISTINCT CASE WHEN conv.event_name = 'sign_up' THEN base.full_session_id END) AS sign_ups,
COUNT(DISTINCT CASE WHEN conv.event_name = 'begin_checkout' THEN base.full_session_id END) AS begin_checkouts,
COUNT(DISTINCT CASE WHEN conv.event_name = 'add_to_cart' THEN base.full_session_id END) AS add_to_carts,
(
COUNT(DISTINCT CASE WHEN conv.event_name = 'purchase' THEN base.full_session_id END) +
COUNT(DISTINCT CASE WHEN conv.event_name = 'generate_lead' THEN base.full_session_id END) +
COUNT(DISTINCT CASE WHEN conv.event_name = 'sign_up' THEN base.full_session_id END) +
COUNT(DISTINCT CASE WHEN conv.event_name = 'begin_checkout' THEN base.full_session_id END) +
COUNT(DISTINCT CASE WHEN conv.event_name = 'add_to_cart' THEN base.full_session_id END)
) AS total_conversions,
SAFE_DIVIDE(
COUNT(DISTINCT CASE WHEN conv.event_name = 'purchase' THEN base.full_session_id END),
COUNT(DISTINCT base.full_session_id)
) AS purchase_conversion_rate
FROM
base_events AS base
LEFT JOIN
conversion_events AS conv
ON
base.full_session_id = conv.full_session_id
GROUP BY
base.page_path,
base.page_location
Shows the number of sessions in which each product was viewed on a product detail page and how many of those sessions went on to purchase the same product. This helps measure product-level conversion performance from view to purchase.
-- Product Detail Page Conversion Rate
WITH product_views AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST(
(SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id') AS STRING)) AS full_session_id,
item.item_name AS product_name,
item.item_id AS product_id
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`,
UNNEST(items) AS item
WHERE
_TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'view_item'
),
product_purchases AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST(
(SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id') AS STRING)) AS full_session_id,
item.item_name AS product_name,
item.item_id AS product_id
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`,
UNNEST(items) AS item
WHERE
_TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'purchase'
)
SELECT
v.product_id,
v.product_name,
COUNT(DISTINCT v.full_session_id) AS sessions_viewed,
COUNT(DISTINCT p.full_session_id) AS sessions_purchased,
SAFE_DIVIDE(COUNT(DISTINCT p.full_session_id), COUNT(DISTINCT v.full_session_id)) AS conversion_rate
FROM
product_views v
LEFT JOIN
product_purchases p
ON
v.full_session_id = p.full_session_id AND v.product_id = p.product_id
GROUP BY
v.product_id,
v.product_name
ORDER BY
conversion_rate DESC
Calculates the number of sessions that viewed each page path and how many of those sessions ended (exited) on that page. Exit rate is computed as the percentage of sessions that had this page as their final page view. Page paths are derived from page_location by stripping query parameters and enforcing consistent slashes.
-- Exit Rate by Page Path
WITH page_views AS (
SELECT
CONCAT(user_pseudo_id, '-', CAST(
(SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id') AS STRING)) AS full_session_id,
TIMESTAMP_MICROS(event_timestamp) AS event_time,
(SELECT value.string_value
FROM UNNEST(event_params)
WHERE key = 'page_location') AS page_location
FROM
`{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE
_TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name = 'page_view'
),
cleaned_pages AS (
SELECT
full_session_id,
event_time,
page_location,
CONCAT(
REGEXP_REPLACE(
REGEXP_EXTRACT(page_location, r'https?://[^/]+(/[^?]*)'),
r'/$', ''
),
'/'
) AS page_path
FROM page_views
WHERE page_location IS NOT NULL
),
ranked_pages AS (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY full_session_id ORDER BY event_time DESC) AS page_rank
FROM cleaned_pages
),
exit_pages AS (
SELECT DISTINCT full_session_id, page_path
FROM ranked_pages
WHERE page_rank = 1
)
SELECT
pv.page_path,
COUNT(DISTINCT pv.full_session_id) AS sessions_viewed,
COUNT(DISTINCT ep.full_session_id) AS sessions_exited,
SAFE_DIVIDE(COUNT(DISTINCT ep.full_session_id), COUNT(DISTINCT pv.full_session_id)) AS exit_rate
FROM
cleaned_pages pv
LEFT JOIN
exit_pages ep
ON
pv.full_session_id = ep.full_session_id AND pv.page_path = ep.page_path
GROUP BY
pv.page_path
HAVING
COUNT(DISTINCT pv.full_session_id) > 0
ORDER BY
sessions_viewed DESC
Identifies how often key actions (e.g. purchases, sign-ups, form submissions) occur without a recognised user ID. Useful for diagnosing gaps in login or identity stitching.
SELECT
event_name,
COUNTIF(user_id IS NULL) AS anonymous_event_count,
COUNTIF(user_id IS NOT NULL) AS identified_event_count,
ROUND(SAFE_DIVIDE(COUNTIF(user_id IS NULL), COUNT(*)) * 100, 2) AS percent_anonymous
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
AND event_name IN ('purchase', 'generate_lead', 'login', 'sign_up', 'form_submit')
GROUP BY event_name
ORDER BY percent_anonymous DESC
Evaluates how often each event is missing key user identifiers (`user_id`, `user_pseudo_id`, or both). Helps identify where identity tracking may be incomplete or broken across specific events.
SELECT
event_name,
COUNTIF(user_id IS NULL) AS null_user_id,
COUNTIF(user_id IS NOT NULL) AS valid_user_id,
COUNTIF(user_pseudo_id IS NULL) AS null_user_pseudo_id,
COUNTIF(user_pseudo_id IS NOT NULL) AS valid_user_pseudo_id,
COUNTIF(user_id IS NULL AND user_pseudo_id IS NULL) AS null_both_ids
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY event_name
ORDER BY null_both_ids DESC
Flags sessions where a user triggered the `login` event more than once. May indicate tracking duplication or issues with login/logout behaviour on your site.
SELECT
CONCAT(user_pseudo_id, '-', CAST((
SELECT value.int_value
FROM UNNEST(event_params)
WHERE key = 'ga_session_id'
) AS STRING)) AS session_id,
user_pseudo_id,
COUNTIF(event_name = 'login') AS login_count
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY session_id, user_pseudo_id
HAVING login_count > 1
ORDER BY login_count DESC
Detects if a single anonymous user (`user_pseudo_id`) has been linked to multiple `user_id` values—common when login IDs change or if multiple users share a device.
SELECT
user_pseudo_id,
ARRAY_AGG(DISTINCT user_id IGNORE NULLS) AS user_ids
FROM `{{PROJECT_ID}}.{{DATASET}}.events_*`
WHERE _TABLE_SUFFIX BETWEEN '{{START_DATE}}' AND '{{END_DATE}}'
GROUP BY user_pseudo_id
HAVING ARRAY_LENGTH(user_ids) > 1
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Net Impression is a UK-based analytics consultancy, specialising in advanced GA4, GTM, BigQuery, and conversion rate optimisation for agencies and growth teams.