根据第一个表更新第二个表列

Question

我有两张桌子。 一个是Employee ，另一个是Department 。

员工表具有以下列：

Name | Salary | Department Id

部门表有

Department Id| Department Name | SumofSalary

我想明智地更新 SumofSalary 部门

我试过的代码

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

以下将为您提供部门明智的工资总额并在部门表中更新。

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

你可以试试下面的代码一个简单的子查询，它将更新工资部门的总和

    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