SQL搜索前三名的方法是什么

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具体数据和SQL是这样的

WITH Employee AS(

SELECT 1 Id, joe Name,70000 SALARY,1 DepartmentId FROM DUAL UNION ALL

SELECT 2 Id, Henry Name,80000 SALARY,2 DepartmentId FROM DUAL UNION ALL

       SELECT 3 Id, Sam Name,60000 SALARY,2 DepartmentId FROM DUAL UNION ALL

SELECT 4 Id, Max Name,90000 SALARY,1 DepartmentId FROM DUAL UNION ALL

SELECT 5 Id, Janet Name,69000 SALARY,1 DepartmentId FROM DUAL UNION ALL

       SELECT 6 Id, Randy Name,85000 SALARY,1 DepartmentId FROM DUAL

      ),

      Department AS (

SELECT 1 Id, IT Name FROM DUAL UNION ALL

       SELECT 2 Id, Sales Name FROM DUAL

      )

      SELECT T1.Name,T2.*

      FROM

           Department T1

,Employee   T2

      WHERE T1.Id= T2.DepartmentId

      AND 3>

      (

        SELECT COUNT(distinct T3.SALARY) RN

        FROM  Employee T3

WHERE T2.DepartmentId = T3.DepartmentId

        AND T2.SALARY < T3.SALARY

      )

      ORDER BY T2.DEPARTMENTID,T2.SALARY

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