加入多个表格

Question

我有以下表格：

1. comitees [ID，Name，Total_Amount，Total_Members，Starting_Date，Ending_Date]

2. committee_group [Id，Name，Total_Members]

3. Group_Member [Id，Group_Id，Member_Name，Contribution]

我想从committee_group中选择姓名，其中Group_Member的贡献总和等于来自comitees的Total_Amount

这是我到目前为止所拥有的

SELECT committee_group.*, Sum(Case When group_member.Group_Id='1'
                                   THEN group_member.Contribution
                                   ELSE 0 END) 
FROM committee_group
  LEFT JOIN group_member ON group_member.Id = committee_group.Id
  LEFT join comitees ON group_member.Contribution = comitees.Total_Amount

Answer 1

这应该有效，

SELECT a.id,a.Name,a.Total_Members,c.Total_Amount
FROM committee_Group a
INNER JOIN (SELECT Name,sum(Contribution) as 'Sum_Con'
            FROM Group_Member
            GROUP BY Name)b on a.Id=b.Id
INNER JOIN comitees c on c.Total_Amount=b.Sum_Con
                     and b.Name=c.Name