選擇總計只返回SQL Server中的一條記錄

Question

花費超過3小時後，我放棄了。

我有四個表：

Users, Approvals, Centers, Managements 

我的最終目標是讓用戶在用戶角色分開各自管理的總數量（我有兩個角色在這裏：家長和社會成員）

我一直在使用下面的代碼

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 

我期待的查詢結果是因爲以下幾點：

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

但結果總是被設置給了我

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

任何想法如何鞏固結果只有1記錄？

Answer 1

請通過studentid嘗試這樣的事情（未測試）

; 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

您可以查詢象下面這樣：

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