oracle子查询

--公司平均工资  单行单列

--select avg(sal) from emp;

--找到高于此平均工资的雇员姓名、职位、工资

--select e.ename,e.job,e.sal

--from emp e

--where e.sal >(select avg(sal) from emp);

--领导姓名

--select e.ename,e.job,e.sal,m.ename,m.job

--from emp e,emp m，dept d

--where e.sal >(select avg(sal) from emp)

--and e.mgr=m.empno(+) and e.deptno=d.deptno;

--部门名称

--select e.ename,e.job,e.sal,m.ename,m.job,d.dname

--from emp e,emp m,dept d

--where e.sal >(select avg(sal) from emp)

--and e.mgr=m.empno(+) and e.deptno=d.deptno;

--部门人数

select e.ename,e.job,e.sal,m.ename,m.job,d.dname,dtemp.count,s.grade,stemp.cou

from emp e,emp m,dept d,(select deptno dno,count(empno) count from emp group by deptno)dtemp,salgrade s,(select s1.grade sg,count(e1.empno) cou

from emp e1,salgrade s1

where e1.sal between s1.losal and s1.hisal

group by s1.grade) stemp

where e.sal >(select avg(sal) from emp)

and e.mgr=m.empno(+) and e.deptno=d.deptno

and dtemp.dno=d.deptno

and e.sal between s.losal and s.hisal

and stemp.sg=s.grade;