Highest Salary in each department

Question

I have a table EmpDetails:

DeptID      EmpName   Salary
Engg        Sam       1000
Engg        Smith     2000
HR          Denis     1500
HR                  


        

Answer 1

Here is a way to get maximum values and names on any version of SQL.

Test Data:

CREATE TABLE EmpDetails(DeptID VARCHAR(10), EmpName VARCHAR(10), Salary DECIMAL(8,2))
INSERT INTO EmpDetails VALUES('Engg','Sam',1000)
INSERT INTO EmpDetails VALUES('Engg','Smith',2000)
INSERT INTO EmpDetails VALUES('HR','Denis',1500)
INSERT INTO EmpDetails VALUES('HR','Danny',3000)
INSERT INTO EmpDetails VALUES('IT','David',2000)
INSERT INTO EmpDetails VALUES('IT','John',3000)

Example:

SELECT ed.DeptID
      ,ed.EmpName
      ,ed.Salary
FROM (SELECT DeptID, MAX(Salary) MaxSal
      FROM EmpDetails
      GROUP BY DeptID)AS empmaxsal
INNER JOIN EmpDetails ed
  ON empmaxsal.DeptID = ed.DeptID
 AND empmaxsal.MaxSal = ed.Salary

Not the most elegant, but it works.