Question

我有一个名为 dbo.Tag 的表，如下所示：

Counter|TagValue
1      |CREATED
2      |REMOVED

我只想从另一个名为 dbo.Transactions

的表中获取与 dbo.Tag 相匹配的记录。

Counter|TagValue
1      |CREATED
1      |UPLOADED
2      |CREATED
2      |REMOVED
3      |DELETED
4      |CREATED
4      |REMOVED

所以，我的预期输出是这样的：

Counter|TagValue
2      |CREATED
2      |REMOVED
4      |CREATED
4      |REMOVED

我尝试做的是以下查询：

SELECT COUNTER FROM dbo.Transactions IN (SELECT * from dbo.Tag)

但是它返回了这个，不是我所需要的：第一个记录“ Counter 1”不应存在，因为它没有“ REMOVED” TagValue

Counter|TagValue
1      |CREATED
2      |CREATED
2      |REMOVED
4      |CREATED
4      |REMOVED

执行上述操作的正确查询是什么？

Answer 1

与过滤器结合使用

SELECT a.COUNTER,a.tagvalue FROM dbo.Transactions a
join dbo.Tag b on a.tagvalue=b.tagvalue
where a.tagvalue in ('CREATED','REMOVED') 
group by a.COUNTER,a.tagvalue
having count(distinct Tagvalue)=2)

Answer 2

我认为这对您会有所帮助：

SELECT * FROM Transactions 
WHERE Counter IN (
  SELECT Counter AS CountOf
  FROM Transactions AS T
  WHERE T.TagValue IN (SELECT TagValue FROM dbo.Tag)
  GROUP BY Counter
  HAVING COUNT(*)>1)

DEMO

Answer 3

您正在寻找的是内部联接。试试以下查询。

SELECT A.COUNTER, A.TagValue 
FROM dbo.Transactions A
INNER JOIN  dbo.Tag B
ON A.COUNTER = B.COUNTER
AND A.TagValue= B.TagValue

Answer 4

以下查询可以为您提供帮助：

SELECT TA.*
FROM dbo.Transactions TA
JOIN (  SELECT [Counter]
        FROM dbo.Transactions 
        WHERE TagValue IN (SELECT TagValue FROM dbo.Tag)  
        GROUP BY [Counter]
        HAVING COUNT(DISTINCT TagValue) = 2
) AS SQ ON SQ.[Counter] = TA.[Counter]

DEMO on db<>fiddle

SQL Server-基于来自另一个表的记录的SELECT记录

4 个答案: