從SQL表通過檢查多列

Question

我有表結構如下獲取記錄

ID DefID AttrID ValInt  ValReal ValDate ValStr 
1  1   1  NULL  NULL  NULL  hi 
2  1   1  NULL  NULL  NULL  hi 
3  1   1  NULL  NULL  NULL  hi 
4  1   1  NULL  NULL  NULL  hi 
1  1   1   0  NULL  NULL  NULL 
2  1   1   1  NULL  NULL  NULL 
3  1   1   0  NULL  NULL  NULL 
4  1   1   0  NULL  NULL  NULL 

這是我的表命名錶，現在我想查詢只具有ValStr =「H1」，以獲得ID和ValInt = 1，僅表示屬於同一ID列的ValStr爲hi且ValInt = 1的ID。請幫忙。

在這裏，我已經做到現在。

select ID from Table where DefID=1 and ValStr='hi' and ValInt=1 

我實際的答案應該是

ID 
2 

，但我從上面的查詢得到這個

ID 
1 
2 
3 
4 

Answer 1

還有一個選項

select t1.ID from Table t1 
where EXISTS (
       SELECT * 
       FROM Table t2 
       WHERE t2.DefID = 1 AND t2.ValStr = 'hi' 
      ) and t1.ValInt = 1 

Answer 2

如何

SELECT distinct t1.ID 
FROM Table t1 
JOIN Table t2 on t1.id = t2.id 
WHERE t1.DefID=1 and t2.DefID = 1 
AND t1.ValStr='hi' and t2.ValInt=1 

或（根據口味）

SELECT distinct t1.ID 
FROM Table t1 
JOIN Table t2 on t1.id = t2.id AND t1.DefID=1 = t2.DefID 
WHERE t1.DefID=1 AND t1.ValStr='hi' and t2.ValInt=1 

Answer 3

SELECT ID 
FROM TableName 
WHERE (DefID = 1 AND ValInt = 1) OR 
     (DefID = 1 AND ValStr = 'hi') 
GROUP BY ID 
HAVING COUNT(*) = 2 

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