Oracle複雜查詢

1：列出所有員工的姓名，部門名稱，和工資

select a1.ename,a1.sal,a2.dname from emp a1,dept a2 where a1.deptno = a2.deptno;

2：列出所有部門的詳細資料和部門人數

select a2.deptno,a2.dname,a2.loc,count(a1.empno) from emp a1,dept a2 where a1.deptno(+) = a2.deptno group by a2.deptno,a2.dname,a2.loc;

3：列出所有員工的年工資，所在部門名稱，按年薪升序排列

select a1.sal*12 ,a2.dname from emp a1,dept a2 where a1.deptno = a2.deptno order by a1.sal*12;

4：查出每個員工的上級主管及所在部門名稱，並要求這些主管的薪水超過3000

select employee.ename,boss.ename ,a1.dname from emp employee,emp boss,dept a1 where employee.mgr = boss.empno and boss.deptno = a1.deptno and boss.sal >3000;

5：求出部門名稱中帶’S’字元的部門員工的工資合計，部門人數

SELECT d.deptno,NVL(SUM(sal),0),COUNT(empno)FROM emp e,dept d WHERE e.deptno(+)=d.deptno AND d.dname LIKE '%S%' GROUP BY d.deptno ;

6：列出部門名稱和這些部門的員工資訊（數量，平均工資），同時列出那些沒有員工的部門

select d.dname,avg(e.sal),count(e.empno) from emp e,dept d where e.deptno(+)=d.deptno group by d.dname;

7：列出在部門”SALES”工作的員工姓名，基本工資，僱用日期，部門名稱，假定不知道銷售部的部門編號

select a1.ename,a1.sal,a1.hiredate,a2.dname from emp a1,dept a2 where a1.deptno = a2.deptno and a2.dname = 'SALES';

8：列出公司各個工資等級僱員的數量，平均工資

select grade,count(*),avg(sal) from emp, salgrade where sal between losal and hisal group by grade;

9：列出薪水高於在部門30工作的所有員工的薪金的員工姓名和薪金，部門名稱

select a1.ename,a1.sal,a2.dname from emp a1, dept a2 where a1.deptno = a2.deptno and sal > all(select sal from emp where deptno = 30);

10：列出受雇日期早於直接上級的所有員工的編號，姓名，部門名稱，部門位置，部門人數

SELECT e.empno,e.ename,d.dname,d.loc,temp.count

FROM emp e,emp m,dept d,(

     SELECT deptno dno, COUNT(empno) count

     FROM emp

     GROUP BY deptno) temp

WHERE e.mgr = m.empno(+) AND e.hiredate < m.hiredate

AND e.deptno = d.deptno

AND e.deptno = temp.dno;

11：列出所有“clerk”的姓名及其部門名稱，部門人數，工資等級

SELECT e.ename , d.dname ,temp.count,s.grade

FROM emp e, dept d,(

     SELECT deptno dno,COUNT(empno) count

     FROM emp

     GROUP BY deptno) temp,salgrade s

WHERE job='CLERK'

AND e.deptno = d.deptno

AND d.deptno = temp.dno

AND e.sal BETWEEN s.losal AND s.hisal;

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