SQL统计所有行而不是统计单个行

我有一个从数据库中请求数据的SQL语句。

SELECT `ID`, `To`, `Poster`, `Content`, `Time`, ifnull(`Aura`,0) as `Aura` FROM ( SELECT * FROM ( SELECT DISTINCT * FROM messages m INNER JOIN ( SELECT Friend2 as Friend FROM friends WHERE Friend1 = '1' UNION ALL SELECT Friend1 as Friend FROM friends WHERE Friend2 = '1' ) friends ON m.Poster = friends.`Friend` UNION ALL SELECT DISTINCT *, '1' FROM messages where `Poster`='1' ) var LEFT JOIN ( select `ID` as `AuraID`, `Status` as `AuraStatus`, count(*) as `Aura` from messages_aura ) aura ON (var.Poster = aura.AuraID AND var.ID = aura.AuraStatus) ) final GROUP BY `ID`, `Poster` ORDER BY `Time` DESC LIMIT 10 

这是我的messages_aura表格布局。 它显示ID ， Status和UserID 。

以上是上述声明的输出。

（以上屏幕截图的ID参考下面的Poster ，以上屏幕截图的Status参考下面的ID ）

声明应该给最底一行一个灵气计数1 ，最上一行灵光计数2 。 怎么了？

Answer 1

你错过了GROUP BY ，所以它正在计算一切，而不是按某些列进行分组。

 LEFT JOIN ( select `ID` as `AuraID`, `Status` as `AuraStatus`, count(*) as `Aura` from messages_aura GROUP BY AuraID, AuraStatus ) aura ON (var.Poster = aura.AuraID AND var.ID = aura.AuraStatus)