The following example uses a search condition in a HAVING clause to select from the Employee table those departments with the number 100, 300, 500, or 600, and with a salary average of at least $35,000 but not more than $55,000:
SELECT AVG(Salary) FROM Employee WHERE DeptNo IN (100,300,500,600) GROUP BY DeptNo HAVING AVG(Salary) BETWEEN 35000 AND 55000 ;