选择总计只返回SQL Server中的一条记录

Question

花费超过3小时后，我放弃了。

我有四个表：

Users, Approvals, Centers, Managements 

我的最终目标是让用户在用户角色分开各自管理的总数量（我有两个角色在这里：家长和社会成员）

我一直在使用下面的代码

select 
    (select count(r.StudentId) 
    from Users u 
    where u.UserId = r.StudentId and u.RoleId = 10) as Parents, 
    (select count(r.StudentId) 
    from Users u 
    where u.UserId = r.StudentId and u.RoleId = 11) as SocietyMembers, 
    e.ManagementId, e.ManagmentTitle 
from 
    CentersRegistrationsApprovals r --ON r.StudentId = u.UserId 
inner join 
    Centers c ON c.CenterId = r.CenterId 
inner join 
    Managments e ON e.ManagementId = c.EducationManagementId 
group by 
    e.ManagementId, e.ManagmentTitle, StudentId 

我期待的查询结果是因为以下几点：

Parents SocietyMambers ManagementId ManagementName 
---------------------------------------------------------------- 
3   3    10    North Region 

但结果总是被设置给了我

Parents SocietyMambers ManagementId ManagementName 
---------------------------------------------------------------- 
3   NULL    10    North Region 
NULL  3    10    North Region 

任何想法如何巩固结果只有1记录？

Answer 1

请通过studentid尝试这样的事情（未测试）

; with CTE1 as (
    select 
     (select count(r.StudentId) 
     from Users u 
     where u.UserId = r.StudentId and u.RoleId = 10) as Parents, 
     (select count(r.StudentId) 
     from Users u 
     where u.UserId = r.StudentId and u.RoleId = 11) as SocietyMembers, 
     e.ManagementId, e.ManagmentTitle 
    from 
     CentersRegistrationsApprovals r --ON r.StudentId = u.UserId 
    inner join 
     Centers c ON c.CenterId = r.CenterId 
    inner join 
     Managments e ON e.ManagementId = c.EducationManagementId 
    group by 
     e.ManagementId, e.ManagmentTitle, StudentId 
) 
SELECT MAX(Parents), MAX(SocietyMembers), ManagementId, StudentId 
FROM CTE1 
GROUP BY ManagementId, StudentId 

Answer 2

您可以查询象下面这样：

select 
    Sum(case when u.roleId = 10 then 1 else 0 end) as Parents, 
    Sum(case when u.roleId = 11 then 1 else 0 end) as SocietyMembers, 
    e.ManagementId, e.ManagmentTitle 
from 
    CentersRegistrationsApprovals r --ON r.StudentId = u.UserId 
inner join 
    Centers c ON c.CenterId = r.CenterId 
inner join 
    Managments e ON e.ManagementId = c.EducationManagementId 
Join Users u ON r.StudentId = u.UserId 
group by 
    e.ManagementId, e.ManagmentTitle