如何在实体框架中实现此sql？

Question

的SQL是：

select 
    a.Id, a.Name,a. ParentId, 
    sum(a.departmentCount), 
    sum(a.userCount) 
from 
    (select 
     d.*, 
     0 as departmentCount, 
     count(u.Id) as userCount 
    from 
     dbo.DepartmentSet d 
    left join 
     dbo.UserSet u on d.Id = u.DepartmentId 
    where 
     d.ParentId is null 
    group by 
     d.Id, d.Name, d.ParentId 

    union all 

    select 
     d.*, 
     count(d2.Id) as departmentCount, 
     0 as userCount 
    from 
     dbo.DepartmentSet d 
    left join 
     dbo.DepartmentSet d2 on d.Id = d2.ParentId 
    where 
     d.ParentId is null 
    group by 
     d.Id, d.Name, d.ParentId) a 
group by 
    a.Id, a.Name, a.ParentId 

Answer 1

下面是一篇文章，介绍如何做子查询应该让你的代码去

how to do subquery in LINQ