Question

我有以下SQL语句（到目前为止）：

SELECT p.facebookID,p.points,pi.facebookID,pi.points, SUM(pi.points) FROM player AS p 
INNER JOIN invites AS i ON p.id = i.inviteFromID 
INNER JOIN player AS pi ON i.inviteToId  = pi.facebookID
WHERE p.id = 1 GROUP BY pi.points

这将告诉我，UserId邀请哪个用户= 1以及他们获得了哪些点。

目标：
我需要选择UserId的所有邀请点的SUM 我怎样才能做到这一点？我的方式是正确的吗？

Answer 1

你不应该按照pi.points分组，而是按用户ID分组，我相信......试试这个

SELECT p.facebookID,p.points,pi.facebookID,pi.points, SUM(pi.points) FROM player AS p 
INNER JOIN invites AS i ON p.id = i.inviteFromID 
INNER JOIN player AS pi ON i.inviteToId  = pi.facebookID
WHERE p.id = 1 GROUP BY p.id

假设p.id是您的用户ID

让我知道这是如何运作的

MYSQL - 来自三个表的SUM点

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