oracle高級查詢（二）

select * from salgrade;


select * from emp;


--顯示員工的名字、工資及部門的名字
select e.ename,e.sal,d.dname from emp e,dept d where e.deptno=d.deptno;


--顯示部門編號爲10的部門的員工的名字、工資及部門的名稱
select e.ename,e.sal,d.dname from emp e,dept d where e.deptno=d.deptno and d.deptno=10;


--顯示員工的名字、工資及部門的名稱,並按部門名稱升序排序
select e.ename,e.sal,d.dname from emp e,dept d where e.deptno=d.deptno order by d.deptno;


--顯示員工的名字、工資及工資級別
select e.ename,e.sal,g.grade from emp e,salgrade g where e.sal between g.losal and g.hisal;


--顯示SMITH上級領導的姓名(自連接,對同一張表進行連接查詢)
select ename from emp where empno=(select mgr from emp where ename='SMITH');


--顯示各個員工的姓名和他的上級領導的名字
select e.ename,m.ename from emp e,emp m where e.mgr=m.empno;


select e.*,m.* from emp e,emp m where e.mgr=m.empno;


--顯示SMITH同一部門的所有員工
select * from emp where deptno=(select deptno from emp where ename='SMITH');


select * from emp where deptno in(select deptno from emp where ename='SMITH');


--顯示SMITH同一部門的所有員工，但不包含SMITH
select * from emp where deptno=(select deptno from emp where ename='SMITH')
and ename<>'SMITH';


select * from emp where deptno=(select deptno from emp where ename='SMITH')
and ename!='SMITH';




--顯示部門平資低於2000的部門號和它的平均工資


select deptno,avg(sal) from emp group by deptno having avg(sal)<2000;


--查詢部門號爲10員工所參加的工作崗位相同的工作崗位的員工名字、崗位、工資、部門號


select * from emp where job in (select job from emp where deptno=10);


select * from emp where job in(select job from emp where deptno=10);


--查詢比30號部門所有員工的工資高的員工姓名、工資、部門號


select * from emp where sal>(select max(sal) from emp where deptno=30);


select * from emp where sal >all (select sal from emp where deptno=30);




select * from emp where sal >(select max(sal) from emp where deptno=30);
select * from emp where sal > all (select sal from emp where deptno=30);


--查詢比30號部門任意一個員工的工資高的員工姓名、工資、部門號
select * from emp where sal >(select min(sal) from emp where deptno=30);
select * from emp where sal > any (select sal from emp where deptno=30);




select * from emp where sal>(select min(sal) from emp where deptno=30);
select * from emp where sal> any (select sal from emp where deptno=30);
--查詢與SMITH部門和工作崗位完全相同的所有員工信息(多列子查詢)


select * from emp where deptno=(select deptno from emp where ename='SMITH') 
and job=(select job from emp where ename='SMITH');




select * from emp where (deptno,job)=(select deptno,job from emp where ename='SMITH');






select * from emp where deptno=(select deptno from emp where ename='SMITH') 
and job=(select job from emp where ename='SMITH');


select * from emp where (deptno,job)=(select deptno,job from emp where ename='SMITH');


--如何顯示工資高於本部門平均工資的員工的信息(from中使用子查詢)




select avg(sal),deptno from emp group by deptno;




select e.* from emp e,(select avg(sal) avgSal,deptno from emp group by deptno) d where e.deptno=d.deptno and e.sal>d.avgSal;






select avg(sal),deptno from emp group by deptno; 


select * from emp e,(select avg(sal) avgSal,deptno from emp group by deptno) d where e.deptno=d.deptno and e.sal>d.avgSal;