Mysql中的复合查询详解

select *from emp where ename like 'j%' and (sal>500 or job='MANAGER');

select ename ,job,sal*12+ifnull(comm,0) sarn  from emp order by sarn desc;

select ename ,job ,sal from emp where sal in(select max(sal) from emp );

select ename ,job ,sal from emp order by sal desc limit 1;

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

select deptno,format(avg(sal),2),max(sal) from emp group by deptno;

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

select job ,count(*) from emp group by job;

select * from emp,dept where emp.deptno=dept.deptno and emp.deptno=10;

select ename,sal,dname from emp,dept 
where emp.deptno=dept.deptno and emp.deptno=10;

select ename ,sal,grade from emp,salgrade where sal between losal and hisal;

select * from emp e1, emp e2 where e1.empno=e2.mgr;

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

select ename ,job,sal,deptno from emp where 
job in(select job from emp where deptno =10)and deptno<>10;

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

select ename,sal,deptno from emp 
where sal>any(select sal from emp where deptno=30);

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

select ename,deptno,sal,asal from emp t1,(select deptno dt,avg(sal) asal  
from emp group by dt)t2 where t1.sal>t2.asal and t1.deptno=t2.dt;

select ename,sal,emp.deptno,msal 
from emp ,(select deptno,max(sal)msal from emp group by deptno) 
emp2 where sal=msal and emp.deptno=emp2.deptno ;

select *from dept,
(select deptno,count(deptno) from emp group by deptno)dept2 
where dept.deptno=dept2.deptno;