今天看到这样个问题，比如找出每个部门里薪资在前三的所有员工信息
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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