MySQL加入一個表與多個表

Question

我有4張桌子：

ADS ：ID，文字， 數字

TABLE2 ：id，user_id， 數字
TABLE3 ：id，user_id， 數字
TABLE4 ：id，user_id， 數字

user_id不是唯一的。 可以存在與否。

我想要的輸出：
如果數 ADS表等於數 TABLE1或TABLE2或TABLE3 ，顯示文本-唯一部分。

我試過了：

SELECT ADS.text FROM ADS 
LEFT JOIN TABLE2 ON TABLE2.user_id = ? 
LEFT JOIN TABLE3 ON TABLE3.user_id = ? 
LEFT JOIN TABLE4 ON TABLE4.user_id = ? 
WHERE ADS.number = TABLE2.number OR 
ADS.number = TABLE3.number OR 
ADS.number = TABLE4.number 
GROUP BY ADS.id 

和

SELECT * FROM 
(
SELECT 
ADS.text FROM ADS 
LEFT JOIN TABLE2 ON TABLE2.user_id = ? 
LEFT JOIN TABLE3 ON TABLE3.user_id = ? 
LEFT JOIN TABLE4 ON TABLE4.user_id = ? 
WHERE ADS.number = TABLE2.number OR 
ADS.number = TABLE3.number OR 
ADS.number = TABLE4.number 

UNION ALL

SELECT 
ADS.text FROM ADS 
LEFT JOIN TABLE2 ON TABLE2.user_id = ? 
LEFT JOIN TABLE3 ON TABLE3.user_id = ? 
LEFT JOIN TABLE4 ON TABLE4.user_id = ? 
WHERE ADS.number = TABLE2.number OR 
ADS.number = TABLE3.number OR 
ADS.number = TABLE4.number 
) request 
ORDER BY ADS.id

$reponse->execute(array($_SESSION['id'],$_SESSION['id'],$_SESSION['id']));

我總是輸出過多或不足...

Answer 1

這是您想要的嗎？

SELECT ADS.text
FROM ADS a
WHERE EXISTS (SELECT 1 FROM TABLE2 t WHERE t.user_id = ? AND t.number = a.number) OR
      EXISTS (SELECT 1 FROM TABLE3 t WHERE t.user_id = ? AND t.number = a.number) OR
      EXISTS (SELECT 1 FROM TABLE4 t WHERE t.user_id = ? AND t.number = a.number);