update 2nd table column based on 1st table

Question

I have two tables. One is Employee and other is Department .

Employee table has following columns:

Name | Salary | Department Id

Department table has

Department Id| Department Name | SumofSalary

I want to update SumofSalary department wise

Code I have tried

update Department set sumofsalary =
(
    select D.deptid, SUM(E.salary) from Department D inner join Employesalary E 
    on d.deptid=e.deptid group by D.deptid
)

Answer 1

Following will give you sum of salaries department wise and update in department table.

UPDATE D SET D.SumOfSalary = T.Salary FROM Department D JOIN 
(
    SELECT SUM(Salary) Salary, [Department ID] DeptID FROM Employee Group By [Deptartment ID]
) T ON T.DeptID = D.[Department ID] 

Answer 2

You can try the below code a simple subquery Which will update the sum salary department wise

    UPDATE  dept
    SET dept.sum =h.totalSum  FROM (select  a.deptid, SUM( a.Salary) AS 
    totalSum FROM emp a
    Group By a.deptid) h WHERE 
    dept.deptid=h.deptid