我有以下查询我的users
和chats
表运行的加入,我想group by
我chats
表user_id OR receiver_id
不只是user_id
就像你可以看到下面的SQL查询中INNER JOIN
。复杂MySQL的搜索查询
SELECT c.*, users.username, users.firstname, users.lastname
FROM chats c
INNER JOIN(SELECT MAX(created) AS Date, user_id, receiver_id, chat, type, id
FROM chats
WHERE receiver_id = 286 OR user_id = 286
GROUP BY user_id) cc ON cc.Date = c.created AND cc.user_id = c.user_id
LEFT JOIN users ON users.id = c.user_id
WHERE c.receiver_id = 286 OR c.user_id = 286
我试图GROUP BY user_id OR receiver_id
,但我似乎无法获得ID 286或者receiver_id或USER_ID信息。
有没有一种方法,我们可以通过这样实现它和组,我们可以考虑两列,并拿出从两个结果?
我需要做两个查询和将它们连接在一起呢?
只是可以肯定,你的'charts'表包含任何具有user_id 286或receiver_id 286的行? – Arjan 2012-01-29 17:13:52