解法一: select ename from (select ename from emp order by sal desc) where rownum=1;

解法二: select ename from emp where sal=(select max(sal) from emp);

解法三: select ename, sal from emp where sal not in (select distinct t1.sal from emp t1 inner join emp t2 on t1.sal < t2.sal);

1. 計算每位員工的年薪

select ename, sal*12+nvl(comm, 0) annualSalary from emp;

2. 統計有員工的部門的人數

select count(distinct deptno) from emp;

3. 求掙最高薪水的員工(boss除外)的姓名

select ename from emp where sal = (select max(sal) from emp where job<>upper('president'));

4. 查詢薪水超過平均薪水的員工的姓名和工資

select ename, sal from emp where sal > (select avg(sal) from emp);

5. 查詢薪水超過其所在部門平均薪水的員工的姓名、部門編號和工資

select ename, t1.deptno, to_char(sal, '$9,999.9') sal, to_char(round(t2.avgsal, 1), '$9,999.9') avg from emp t1,(select deptno, avg(sal)

avgsal from emp group by deptno) t2 where t1.sal > t2.avgsal and t1.deptno = t2.deptno;

6. 查詢部門中薪水最高的人姓名、工資和所在部門名稱

select ename, sal, dname from emp t1

inner join

(select deptno, max(sal) maxsal from emp group by deptno) t2

on t1.deptno = t2.deptno and t1.sal = t2.maxsal

inner join

dept t3 on t3.deptno = t1.deptno;

7. 查詢部門平均薪水的等級

select deptno, avg, grade from (select deptno, avg(sal) avg from emp group by deptno) t1 inner join salgrade t2 on t1.avg between

t2.losal and t2.hisal;

8. 哪些人是主管

select ename from emp

where empno in (select distinct mgr from emp);

9. 求平均薪水最高的部門的名稱和平均工資

select dname, to_char(avg, '$9,999.9') avg from dept t1

inner join (select deptno, avg from (select deptno, avg(sal) avg from emp group by deptno) where avg = (select max(avg) from (select deptno, avg(sal) avg from emp group by deptno))) t2 on t1.deptno = t2.deptno;

10. 求薪水最高的前3名雇員

select * from (select ename, sal from emp order by sal desc) t where rownum <= 3;

11. 求薪水最高的第4-6名雇員

select ename, sal from (select rownum as rn, t.* from (select ename, sal from emp order by sal desc) t) where rn >= 4 and rn <= 6;

12. 求薪水最低的部門經理所在部門的名稱

總結

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