MySQL SELECT IN與子查詢

Question

好吧，所以我在以下方面遇到了問題。我試圖用兩個子查詢來做一個選擇語句。 我需要做的基本上是以下內容。

滿足以下條件的SELECT * FROM messages WHERE 。

條件1：

 SELECT id 
 FROM messages 
 WHERE `receiver` = 123510 && sender= 123457 && status != 3;

條件2：

 SELECT id 
 FROM messages 
 WHERE receiver = 123457 && sender = 123510 && status !=4;

我嘗試執行以下操作：

SELECT * 
FROM messages 
WHERE id IN (
                 (
                     SELECT id 
                     FROM messages 
                     WHERE `receiver` = 123510 && sender= 123457 && status != 3
                 ),
                 (
                     SELECT id 
                     FROM messages 
                     WHERE receiver = 123457 && sender = 123510 && status !=4)
                  )  

但是當我這樣做時，mysql帶着子查詢返回了超過1行...

關於如何解決這個問題有什么建議嗎？

Answer 1

我認為這是您要尋找的：

SELECT *
FROM messages
WHERE (receiver = 123510 AND sender = 123457 AND status <> 3) OR
      (receiver = 123457 AND sender = 123510 AND status <> 4);

Answer 2

您將必須使用聯合來分隔每個查詢，或者將其作為兩個單獨的IN（以OR分隔）來完成。

SELECT * 
FROM messages 
WHERE id IN (
          SELECT id
          FROM messages
          WHERE `receiver` = 123510 and 
                sender= 123457 and 
                status != 3) or
          UNION
          SELECT id
          FROM messages 
          WHERE receiver = 123457 and 
          sender = 123510 and
          status !=4)

但實際上，這樣做會更好。

SELECT * 
FROM messages 
WHERE (`receiver` = 123510 and 
       sender = 123457 and 
       status != 3) or
      (receiver = 123457 and 
       sender = 123510 and
       status !=4)