在每个部门中找到第一和第二高的薪水. [英] find the first and second highest sal in each department....

问题描述

我们如何在不同的查询中找到每个部门的第一和第二高薪水(也应显示该部门)...

how will we find the first and second highest sal in each department(the department should also be displayed)...???in different-different queries...

     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 19-APR-87       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 23-MAY-87       1100                    20

     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10

推荐答案

部门最高薪水

Highest Salary by Dept

SELECT  DEPTNO, max(SAL) as MaxSalary FROM EmpSal
group BY DEPTNO

部门第二好的薪水

Second Best Salary by Dept

SELECT es.DEPTNO,max(es.SAL) as SecondBest FROM 
(
SELECT  DEPTNO, max(SAL) as MaxSalary FROM EmpSal
group BY DEPTNO) P
JOIN EmpSal es ON P.DEPTNO= es.DEPTNO
WHERE es.SAL!= P.MaxSalary
GROUP BY es.DEPTNO

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