在 BigQuery 上重新创建 GA 漏斗

问题描述

我正在尝试使用 BigQuery 重新创建 GA 漏斗(Google360 上的自定义报告).GA 上的漏斗使用每个页面上发生的唯一事件计数.我在网上发现这个查询在大多数情况下都有效:

I am trying to recreate the GA funnel (custom report on Google360) using BigQuery. The funnel on GA is using the unique count of events that happen on each page. I found this query online that is working for the most part:

SELECT
  COUNT( s0.firstHit) AS Landing_Page,
  COUNT( s1.firstHit) AS Model_Selection
from(
SELECT
      s0.fullvisitorID,
      s0.firstHit,
      s1.firstHit,
    FROM (
            # Begin Subquery #1 aka s0
            SELECT
                    fullvisitorID,
                    MIN(hits.hitNumber) AS firstHit
            FROm [64269470.ga_sessions_20170720]
            WHERE
                  hits.eventInfo.eventAction  in ('landing_page')
                    AND totals.visits = 1
            GROUP BY
                  fullvisitorID
                  ) s0
    # End Subquery #1 aka s0

    left join (

    # Begin Subquery #2 aka s1
          SELECT
              fullvisitorID,
              MIN(hits.hitNumber) AS firstHit
          FROM [64269470.ga_sessions_20170720]
          WHERE
            hits.eventInfo.eventAction  in ('model_selection_page')
            AND totals.visits = 1
          GROUP BY
                fullvisitorID,
                ) s1

      ON
    s0.fullvisitorID = s1.fullvisitorID

    )

查询工作正常，登陆页面的值与我在 GA 上获得的值相同，但 Model_Selection 高出约 10%.这种差异也沿着漏斗增加(为了清楚起见，我只发布了 2 个步骤).知道我在这里缺少什么吗?

The query works fine and the value for landing page is the same as I can get on GA, but Model_Selection is about 10% higher. This difference also increases along the funnel (I only posted 2 steps for clarity).Any idea what am I missing here?

推荐答案

此查询满足您的需求，但在 标准 SQL 版本:

This query does what you need but in Standard SQL Version:

#standardSQL
SELECT
  SUM((SELECT COUNTIF(eventInfo.eventAction = 'landing_page') FROM UNNEST(hits))) Landing_Page,
  SUM((SELECT COUNTIF(eventInfo.eventAction = 'model_selection_page') FROM UNNEST(hits) WHERE EXISTS(SELECT 1 FROM UNNEST(hits) WHERE eventInfo.eventAction = 'landing_page'))) Model_Selection
FROM `64269470.ga_sessions_20170720`

就是这样.4 条线路，更快更便宜.

Just that. 4 lines, way faster and cheaper.

您还可以使用模拟数据，例如:

You can also play with simulated data, something like:

#standardSQL
WITH data AS(
  SELECT '1' AS fullvisitorid, ARRAY<STRUCT<eventInfo STRUCT<eventAction STRING > >> [STRUCT(STRUCT('landing_page' AS eventAction) AS eventInfo)] AS hits UNION ALL
  SELECT '1' AS fullvisitorid, ARRAY<STRUCT<eventInfo STRUCT<eventAction STRING > >> [STRUCT(STRUCT('landing_page' AS eventAction) AS eventInfo), STRUCT(STRUCT('landing_page' AS eventAction) AS eventInfo)] AS hits UNION ALL
  SELECT '1' AS fullvisitorid, ARRAY<STRUCT<eventInfo STRUCT<eventAction STRING > >> [STRUCT(STRUCT('landing_page' AS eventAction) AS eventInfo), STRUCT(STRUCT('model_selection_page' AS eventAction) AS eventInfo)] AS hits UNION ALL
  SELECT '1' AS fullvisitorid, ARRAY<STRUCT<eventInfo STRUCT<eventAction STRING > >> [STRUCT(STRUCT('model_selection_page' AS eventAction) AS eventInfo), STRUCT(STRUCT('model_selection_page' AS eventAction) AS eventInfo)] AS hits
)

SELECT
  SUM((SELECT COUNTIF(eventInfo.eventAction = 'landing_page') FROM UNNEST(hits))) Landing_Page,
  SUM((SELECT COUNTIF(eventInfo.eventAction = 'model_selection_page') FROM UNNEST(hits) WHERE EXISTS(SELECT 1 FROM UNNEST(hits) WHERE eventInfo.eventAction = 'landing_page'))) Model_Selection
FROM data

请注意，在 GA 中构建这种类型的报告可能会更困难一些，因为您需要选择至少触发过一次事件landing_page"然后触发事件model_selection_page"的访问者.确保您在 GA 中也正确构建了此报告(一种方法可能是首先构建仅包含触发landing_page"的客户的自定义报告，然后应用第二个过滤器查找model_selection_page").

Notice that building this type of report in GA might be a bit more difficult as you need to select visitors who had at least fired once the event 'landing_page' and then had the event 'model_selection_page' fired. Make sure you got this report built correctly as well in your GA (one way might be to first build a customized report with only customers who had 'landing_page' fired and then apply the second filter looking for 'model_selection_page').

:

您在评论中提出要在会话和用户级别进行计数.为了计算每个会话，您可以将每个子查询评估的结果限制为 1，如下所示:

You asked in your comment about bringing this counting on the session and user level. For counting each session, you can limit the results to 1 for each sub-query evaluation, like so:

SELECT
  SUM((SELECT 1 FROM UNNEST(hits) WHERE eventInfo.eventAction = 'landing_page' LIMIT 1)) Landing_Page,
  SUM((SELECT 1 FROM UNNEST(hits) WHERE EXISTS(SELECT 1 FROM UNNEST(hits) WHERE eventInfo.eventAction = 'landing_page') AND eventInfo.eventAction = 'model_selection_page' LIMIT 1)) Model_Selection
FROM data

为了计算不同的用户，想法是一样的，但你必须应用 COUNT(DISTINCT) 操作，就像这样:

For counting distinct users, the idea is the same but you'd have to apply a COUNT(DISTINCT) operation, like so:

SELECT
  COUNT(DISTINCT(SELECT fullvisitorid FROM UNNEST(hits) WHERE eventInfo.eventAction = 'landing_page' LIMIT 1)) Landing_Page,
  COUNT(DISTINCT(SELECT fullvisitorid FROM UNNEST(hits) WHERE EXISTS(SELECT 1 FROM UNNEST(hits) WHERE eventInfo.eventAction = 'landing_page') AND eventInfo.eventAction = 'model_selection_page' LIMIT 1)) Model_Selection
FROM data

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