[英]mysql joining 2 tables getting 2 different values from the same table
我有2張桌子想加入...
表“用戶”:
列:
uid =>用戶索引
名稱=>用戶名
表“消息”:
列:
fromid =>發送者用戶索引
toid =>接收者用戶索引
信息=>短信
我想要這樣的輸出: from_username | to_username | 留言|
我可以得到 from_username | 留言| 與此查詢:
SELECT messages.message, users.name FROM messages,users WHERE messages.fromid = users.uid;
您需要完成兩次連接:
Select f.name, t.name, message from messages
Left join users as f on messages.fromID = f.uid
Left join users as t On messages.toid = t.uid
對於完整的連接語法(和一些解釋),MySQL doc頁面還不錯http://dev.mysql.com/doc/refman/5.0/en/join.html
嘗試
SELECT sender.name, receiver.name, message
FROM messages
INNER JOIN users sender
ON messages.fromid = sender.uid
INNER JOIN users receiver
ON messages.toid = receiver.uid
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