BigQuery 问题：同一访问者的时间戳如何以及为啥相同？

Posted 2023-03-24

【中文标题】BigQuery 问题：同一访问者的时间戳如何以及为啥相同？

【英文标题】：BigQuery issue: how & why the timestamp can be the same for the same visitor?BigQuery 问题：同一访问者的时间戳如何以及为什么相同？

【发布时间】：2017-03-17 11:54:52

【问题描述】：

对于通过 2 个不同浏览器访问网站的同一访问者，我在 BigQuery 中的“visitStartTime”时间戳字段中遇到以下问题？ 如何以及为什么可能（时间戳应该改变，因为通常使用基于正数的时间戳计算秒数指定自 unix 纪元（1970-01-01 00:00:00 UTC）以来的秒数？

产生截图结果的查询：

SELECT
  DATE,
  MAX(CASE
      WHEN customDimensions.index = 1 THEN customDimensions.value END) AS CUSTOMDIMENSIONS_VALUE,  visitNumber,  fullvisitorid,  visitStartTime,  SEC_TO_TIMESTAMP(visitStartTime) AS humain,  TIME (visitStartTime+3600 ) AS Paris_timezone,  hits.hour,  hits.minute,  CONCAT(fullvisitorid, STRING(visitid)) AS sessionid,  MAX(CASE
      WHEN hits.customDimensions.index = 11 THEN hits.customDimensions.value END) AS localproductname,
  device.deviceCategory,
  hits.page.pagePath,
  IFNULL(hits.page.pagePathLevel2, '') AS HITS_PAGE_PAGEPATHLEVEL2,
  IFNULL(hits.page.pagePathLevel3, '') AS HITS_PAGE_PAGEPATHLEVEL3,
  MAX(CASE
      WHEN hits.customDimensions.index = 14 THEN hits.customDimensions.value END) AS assetpurpose,
  hits.hitNumber,
FROM (FLATTEN([85801771.ga_sessions_20161025], customDimensions.value )),
  (FLATTEN([85801771.ga_sessions_20161026], customDimensions.value )),
WHERE
  AND customDimensions.value != "null"
  AND customDimensions.value = "968a9587-0614-4155-9597-bf17aef42125"
  AND hits.type = 'PAGE'
  AND (customDimensions.index = 1
    OR hits.customDimensions.index = 11
    OR hits.customDimensions.index = 14
    OR hits.customDimensions.index = 27 )
GROUP EACH BY
  DATE,
  visitStartTime,
  humain,
  Paris_timezone,
  hits.hour,
  hits.minute,
  fullVisitorId,
  sessionid,
  visitNumber,
  device.deviceCategory,
  hits.page.pagePath,
  HITS_PAGE_PAGEPATHLEVEL2,
  HITS_PAGE_PAGEPATHLEVEL3,
  hits.hitNumber,
LIMIT
  100000

【问题讨论】：

请编辑您的问题以显示您遇到问题的代码的Minimal, Complete, and Verifiable example，然后我们可以尝试帮助解决具体问题。你也可以阅读How to Ask。

【参考方案1】：

根据列名，我假设您从 Google Analytics (https://support.google.com/analytics/answer/3437719?hl=en) 获得了这些数据。文档说

表中的每一行对应于 Google Analytics（分析）中的一个会话 360.

因此visitStartTime 对应于会话的开始。从您所附的屏幕截图中不清楚是否发生了行扁平化，但如果发生了 - 这将解释它。

【讨论】：

谢谢摩沙，我加个查询例子；它可能会对你有所帮助。

SELECT DATE, MAX(CASE WHEN customDimensions.index = 1 THEN customDimensions.value END) AS CUSTOMDIMENSIONS_VALUE, visitNumber, fullvisitorid, visitStartTime, SEC_TO_TIMESTAMP(visitStartTime) AS humain, TIME (visitStartTime+3600) as Paris_timezone , hits.hour, hits.minute, CONCAT(fullvisitorid, STRING(visitid)) AS sessionid, MAX(CASE

当 hits.customDimensions.index = 11 THEN hits.customDimensions.value END) AS localproductname, device.deviceCategory, hits.page.pagePath, IFNULL(hits.page.pagePathLevel2, '') AS HITS_PAGE_PAGEPATHLEVEL2 , IFNULL(hits.page.pagePathLevel3, '') AS HITS_PAGE_PAGEPATHLEVEL3, MAX(CASE WHEN hits.customDimensions.index = 14 THEN hits.customDimensions.value END) 作为资产用途, hits.hitNumber, FROM (FLATTEN([85801771.ga_sessions_20161025] , customDimensions.value )), (FLATTEN([85801771.ga_sessions_20161026], customDimensions.value )),

WHERE AND customDimensions.value != "null" AND customDimensions.value = "968a9587-0614-4155-9597-bf17aef42125" AND hits.type = 'PAGE' AND (customDimensions.index = 1 OR hits.customDimensions.index = 11 OR hits.customDimensions.index = 14 OR hits.customDimensions.index = 27）按日期分组，visitStartTime，humain，Paris_timezone，hits.hour，hits.minute，fullVisitorId，sessionid，visitNumber，设备.deviceCategory, hits.page.pagePath, HITS_PAGE_PAGEPATHLEVEL2, HITS_PAGE_PAGEPATHLEVEL3, hits.hitNumber, LIMIT 100000

@sPujade - 请不要使用 cmets 来显示您的代码 - 只需将其添加到您的原始问题中！