Question

下面的查询将选择并显示我的一张表中的所有重复项。

SELECT KeyReport, Analytics, Description, AsOfDate, COUNT(*) as CNT
FROM  `corp-analytics.Reports.Metrics`
GROUP BY KeyReport, Analytics, Description, AsOfDate
HAVING COUNT(*) > 1 AND AsOfDate IN('01-03-2019','01-17-2019')

因此，如果我在以下查询中将其用作子查询......

Delete
From Table 
Where Exists (sub-query)

我希望它会删除所有重复项，但我会收到此消息：

Cannot set destination table in jobs with DML statements

所以，我的问题是，为什么下面的查询不删除重复对象？

Delete
From `corp-analytics.Reports.Metrics`
Where Exists (SELECT KeyReport, Analytics, Description, AsOfDate, COUNT(*) as CNT
FROM  `corp-analytics.Reports.Metrics`
GROUP BY KeyReport, Analytics, Description, AsOfDate
HAVING COUNT(*) > 1 AND AsOfDate IN('01-03-2019','01-17-2019'))

此表中没有任何唯一ID。

Answer 1

您尝试过吗？您的HAVING子句正在对count（*）进行过滤。完成分组后，您将找不到重复的内容。

Delete
From `corp-analytics.Reports.Metrics`
Where Exists (SELECT KeyReport, Analytics, Description, AsOfDate, COUNT(*) as CNT
FROM  `corp-analytics.Reports.Metrics`
GROUP BY KeyReport, Analytics, Description, AsOfDate
HAVING CNT > 1 AND AsOfDate IN('01-03-2019','01-17-2019'))

从存在的地方删除-抛出错误

1 个答案: