对

删除就没有，不会有记录

是的，Google Analytics 4 过滤内部流量的三种方法

1、收集机制错误，也就是bug2、经过测试发现，有时候在浏览器中的新窗口打开网站，就会产生session_start，所以如果访问是会在新窗口打开页面的，可能会产生新的session_start，延伸阅读：深入理解 Google Analytics 4 中的会话3、安装有CMP，没有将Cookie列入白名单，导致不断自动清除和重新生成

GTM是一个代码管理工具，可以在上面部署第三方跟踪代码，统一管理，什么是Google Tag Manager

这是查询各渠道会话数和用户数的SELECT CASE WHEN session_source IS NULL THEN 'Direct' WHEN REGEXP_CONTAINS(session_campaign_name, 'cross-network') THEN 'Cross-network' WHEN ( REGEXP_CONTAINS( session_source, 'alibaba|amazon|google shopping|shopify|etsy|ebay|stripe|walmart' ) OR REGEXP_CONTAINS( session_campaign_name, '^(.*(([^a-df-z]|^)shop|shopping).*)$' ) ) AND REGEXP_CONTAINS(session_medium, '^(.*cp.*|ppc|paid.*)$') THEN 'Paid Shopping' WHEN REGEXP_CONTAINS( session_source, 'baidu|bing|duckduckgo|ecosia|google|yahoo|yandex' ) AND REGEXP_CONTAINS(session_medium, '^(.*cp.*|ppc|paid.*)$') THEN 'Paid Search' WHEN REGEXP_CONTAINS( session_source, 'badoo|facebook|fb|instagram|linkedin|pinterest|tiktok|twitter|whatsapp' ) AND REGEXP_CONTAINS(session_medium, '^(.*cp.*|ppc|paid.*)$') THEN 'Paid Social' WHEN REGEXP_CONTAINS( session_source, 'dailymotion|disneyplus|netflix|youtube|vimeo|twitch|vimeo|youtube' ) AND REGEXP_CONTAINS(session_medium, '^(.*cp.*|ppc|paid.*)$') THEN 'Paid Video' WHEN session_medium IN ( 'display', 'banner', 'expandable', 'interstitial', 'cpm' ) THEN 'Display' WHEN REGEXP_CONTAINS( session_source, 'alibaba|amazon|google shopping|shopify|etsy|ebay|stripe|walmart' ) OR REGEXP_CONTAINS( session_campaign_name, '^(.*(([^a-df-z]|^)shop|shopping).*)$' ) THEN 'Organic Shopping' WHEN REGEXP_CONTAINS( session_source, 'badoo|facebook|fb|instagram|linkedin|pinterest|tiktok|twitter|whatsapp' ) OR session_medium IN ( 'social', 'social-network', 'social-media', 'sm', 'social network', 'social media' ) THEN 'Organic Social' WHEN REGEXP_CONTAINS( session_source, 'dailymotion|disneyplus|netflix|youtube|vimeo|twitch|vimeo|youtube' ) OR REGEXP_CONTAINS(session_medium, '^(.*video.*)$') THEN 'Organic Video' WHEN REGEXP_CONTAINS( session_source, 'baidu|bing|duckduckgo|ecosia|google|yahoo|yandex' ) OR session_medium = 'organic' THEN 'Organic Search' WHEN REGEXP_CONTAINS(session_source, 'email|e-mail|e_mail|e mail') OR REGEXP_CONTAINS(session_medium, 'email|e-mail|e_mail|e mail') THEN 'Email' WHEN session_medium = 'affiliate' THEN 'Affiliates' WHEN session_medium = 'referral' THEN 'Referral' WHEN session_medium = 'audio' THEN 'Audio' WHEN session_medium = 'sms' THEN 'SMS' WHEN session_medium LIKE '%push' OR REGEXP_CONTAINS(session_medium, 'mobile|notification') THEN 'Mobile Push Notifications' ELSE 'Unassigned' END AS session_channel, COUNT(DISTINCT session_id) AS sessions, COUNT(DISTINCT user_pseudo_id) AS total_usersFROM ( SELECT CONCAT( user_pseudo_id, ( SELECT value.int_value FROM UNNEST (event_params) WHERE key = 'ga_session_id' ) ) AS session_id, ARRAY_AGG( ( CASE WHEN collected_traffic_source.gclid IS NOT NULL THEN 'google' ELSE collected_traffic_source.manual_source END ) IGNORE NULLS ORDER BY event_timestamp ASC LIMIT 1 ) [SAFE_OFFSET(0)] AS session_source, ARRAY_AGG( ( CASE WHEN collected_traffic_source.gclid IS NOT NULL THEN 'cpc' ELSE collected_traffic_source.manual_medium END ) IGNORE NULLS ORDER BY event_timestamp ASC LIMIT 1 ) [SAFE_OFFSET(0)] AS session_medium, ARRAY_AGG( collected_traffic_source.manual_campaign_name IGNORE NULLS ORDER BY event_timestamp ASC LIMIT 1 ) [SAFE_OFFSET(0)] AS session_campaign_name, user_pseudo_id FROM `mydb-1008.analytics_206759202.events_*` WHERE _TABLE_SUFFIX BETWEEN FORMAT_DATE( '%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 14 DAY) ) AND FORMAT_DATE( '%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY) ) GROUP BY session_id, user_pseudo_id )GROUP BY session_channel

没有简单的，比如要查不同渠道的会话数，Bigquery原始数据session_medium，session_source这两个字段，需要你根据GA4默认渠道分组的定义和优先级去写SQL去实现渠道的划分

漏斗里设置下一个行为是多长时间之内的

first_visit是自动收集事件，处理不了的，会出现一些自动收集的事件跟踪不到，导致指标数值异常。

new users是基于first_visit计算；active users是基于Client Id计算。first_visit事件丢失，才会导致new users少了

同样时间范围，事件报告里first_visit的数量是多少

如何看数据的？