BigQuery 除了双嵌套列

Question

您好，需要从我的表中排除列 hits.latencyTracking.userTimingLabel 并选择所有其他列。如何在标准 Sql 中执行此操作？ 我已经发现了一个关于类似问题的问题 (BigQuery select * except nested column)，但在我的情况下，我有一个双嵌套列，我无法调整代码。 谢谢

Answer 1

以下是我对此的几分钱：
我认为它回答了您的确切问题/案例

#standardSQL
SELECT * REPLACE(
  ARRAY(
    SELECT AS STRUCT hit.* 
      REPLACE((SELECT AS STRUCT latencyTracking.* EXCEPT(userTimingLabel)) AS latencyTracking)
    FROM UNNEST(hits) AS hit
  ) AS hits)
FROM `yourProject.yourDataset.yourTable`    

我在公共表上测试了如下：

#standardSQL
SELECT * REPLACE(
  ARRAY(
    SELECT AS STRUCT hit.* 
      REPLACE((SELECT AS STRUCT page.* EXCEPT(hostname)) AS page)
    FROM UNNEST(hits) AS hit
  ) AS hits)
FROM `google.com:analytics-bigquery.LondonCycleHelmet.ga_sessions_20130910`

Answer 2

如果hits 是一个数组，latencyTracking 是一个结构，那么：

SELECT ARRAY(SELECT (SELECT AS STRUCT latencyTracking.* EXCEPT(userTimingLabel)) AS latencyTracking FROM UNNEST(hits)) AS hits
FROM YourTable;

Answer 3

select * except nested column 和您的问题之间的区别在于hits 是一个数组。以下是如何从结构数组中排除列：

SELECT * REPLACE 
 (ARRAY(SELECT AS STRUCT * EXCEPT(page) FROM UNNEST(hits) h) AS hits)
FROM `google.com:analytics-bigquery.LondonCycleHelmet.ga_sessions_20130910`