Question

您需要从我的表中排除列hits.latencyTracking.userTimingLabel并选择所有其他列。我怎样才能在Standard Sql中执行此操作？我发现已经有类似问题的问题（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。感谢

Answer 1

如果hits是一个数组且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 2

select * except nested column与您的问题之间的差异，是由于hits是ARRAY的事实。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`

Answer 3

以下是我的几分钱：
我认为它可以回答你的确切问题/案例

context.tbl_1
    .Where(i => i.VisitorUserId = 'bf8581b04429fdf56c6ebc')
    .Select(i => new { SellerId = i.SellerId, ProductCount = i.tbl_2.Count() })

我在公共桌面上测试了它，如下所示：

#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`

BigQuery除了双嵌套列

3 个答案: