关于Oracle数据库删除、查询(三)

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select a1.ename,a1.sal,a2.grade from emp a1,salgrade a2 where a1.sal between a2.losal and a2.hisal; select worker.ename,boss.ename from emp worker,emp boss where worker.mgr=boss.empno and worker.mgr='FOLD'; select * from emp where deptno=(

select a1.ename,a1.sal,a2.grade from emp a1,salgrade a2 where a1.sal between a2.losal and a2.hisal;

select worker.ename,boss.ename from emp worker,emp boss where worker.mgr=boss.empno and worker.mgr='FOLD';

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

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

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

别的写法：

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

select * from emp where (deptno,job)=(select septno,job from emp where ename='SMITH');(标红两处顺序要一致)