左連接多個表

Question

基本上我想離開加入 3 個表我已經加入了下面的 2 個表

SELECT  * 
FROM    Shop_id i
        LEFT JOIN Shopper s 
           ON i.shopper_id = s.uid
WHERE   i.shopper_comp > 0 AND 
        i.editor_comp = 0
ORDER BY i.sid

我已經成功加入 Shop_id i 和 Shopper s 我想將 Clients c 添加到我認為的組合中-

SELECT  * 
FROM    Shop_id i
        LEFT JOIN Shopper s, Clients c 
           ON i.shopper_id = s.uid AND i.cid = c.CID
WHERE   i.shopper_comp > 0 AND 
        i.editor_comp = 0
ORDER BY i.sid

我錯了 - 請幫助

Answer 1

您需要為表clients顯式指定關鍵字LEFT JOIN 。

SELECT * 
FROM   Shop_id i
       LEFT JOIN Shopper s
          ON i.shopper_id = s.uid 
       LEFT JOIN Clients c 
          ON i.cid = c.CID
WHERE  i.shopper_comp > 0 AND 
       i.editor_comp = 0
ORDER BY i.sid

Answer 2

你可以這樣試試嗎？

SELECT * FROM Shop_id i
LEFT JOIN Shopper s ON i.shopper_id = s.uid
LEFT JOIN Clients c ON  i.cid = c.CID
WHERE i.shopper_comp >0 AND i.editor_comp =0
ORDER BY i.sid