Question

我在查询时遇到了一些问题，以检查具有不同行的2个相同表之间的差异。这是查询

SELECT *
FROM [PROD01].[myDefDB].[forward].[fv] as DB01
WHERE TargetDate = '20150429' and
NOT EXISTS (SELECT *
    FROM [PROD02].[myDefDB].[forward].[fv] as DB02
    WHERE DB02.TargetDate = '20150429' and
        DB02.Id_Fw = DB01.Id_Fw and
        DB02.Id_Bl = DB01.Id_Bl and
        DB02.Id_Pt = DB01.Id_Pt and
        DB02.TargetDate = DB01.TargetDate and
        DB02.StartDate = DB01.EndDate and
        DB02.EndDate = DB01.EndDate and
        DB02.[Version] = DB01.[Version]
)

考虑[PROD02].[myDefDB].[forward].[fv]是[PROD01].[myDefDB].[forward].[fv]的子集，在SELECT count(*)的两个表上执行TargetDate = '20150429'会返回2367和4103，所以我希望得到1736从那个查询，但我得到超过2000。

我考虑了WHERE子句中的所有PK。我错过了什么？

Answer 1

您可以像这样使用EXCEPT。

SELECT Id_Fw,Id_Bland,Id_Pt,TargetDate,StartDate,EndDate,[Version]
FROM [PROD01].[myDefDB].[forward].[fv] as DB01
WHERE TargetDate = '20150429'
EXCEPT
SELECT Id_Fw,Id_Bl,Id_Pt,TargetDate,StartDate,EndDate,[Version]
FROM [PROD02].[myDefDB].[forward].[fv] as DB02
WHERE TargetDate = '20150429'

这将获取PROD01中不在PROD02

中的所有行

SQL不存在返回查询值

1 个答案: