Google bigQuery实时与ga报告不匹配

Question

您好，我想使用Google bigquery实时表查看实时数据状态。

但是，简单的查询语句与GA报告不匹配。我创建了一个查询，该查询显示每小时的会话数，但是错误率在10％到30％之间。

google bigquery实时的准确性不是很好吗？还是我犯错了？

WITH noDuplicateTable as (
  SELECT
    ARRAY_AGG (t ORDER BY exportTimeUsec DESC LIMIT 1) [OFFSET (0)]. *
    FROM
      `tablename_20 *` AS t
    WHERE
      _TABLE_SUFFIX = FORMAT_DATE ("% y% m% d", CURRENT_DATE ('Asia / Seoul'))
    GROUP BY
      T.VisitKey
  ),
  session as (
    SELECT
      ROW_NUMBER () OVER () sessionRow,
      FORMAT_TIMESTAMP ('% H', TIMESTAMP_SECONDS (time), 'Asia / Seoul') AS startTime,
      sum (session) as session,
      (sum (session) -sum (isvisit)) as uniqueSession,
      (sum (isvisit) / sum (session) * 100) as bounce,
      sum (totalPageView) as totalPageView
      FROM (
        SELECT
        count (visitId) as session,
        visitStartTime as time,
        sum (Ifnull (totals.Bounces, 0)) as isVisit,
        sum (totals.pageviews) as totalPageView
        FROM
          noDuplicateTable
        GROUP BY
          visitStartTime
        )
  GROUP BY startTime
  )
select * from session