如何将这个SQL转换为LINQ？ （涉及的内连接和子查询）

Question

select * from EmployeeScheduleRoles esr 
inner join 
(
    select esr.ScheduleID from Schedules sch 
    inner join EmployeeScheduleRoles esr on esr.ScheduleID = sch.ID 
    inner join Employees emp on emp.ID = esr.EmployeeID 
    where emp.ID = 15921 
) subqry on subqry.ScheduleID = esr.ScheduleID 

限制：不允许包含（）。

Answer 1

这LINQ查询等效您的SQL查询的（这似乎不是很优化，对我来说）

from esr in db.EmployeeScheduleRoles 
join subqry in 
    (from sch in db.Schedules 
    join esr2 in db.EmployeeScheduleRoles on sch.ID equals esr2.ScheduleID 
    join emp in db.Employees on esr2.EmployeeID equals emp.ID 
    where emp.ID == 15921 
    select esr2.ScheduleID) 
on esr.ScheduleID equals subqry 
select esr 

Answer 2

var yours = (from esr in EmployeeScheduleRoles 
join sch in Schedules on esr.ScheduleID equals sch.ID 
join emp in Employees on emp.ID equals esr.EmployeeID 
where emp.ID == 15921 
select esr).toList() 

BT的方式，你的SQL子查询是多余的，你可以select esr.* from Schedules sch