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--单行子查询 select ename,sal,deptno from emp where deptno=(select deptno from emp where ename='SCOTT') select ename,sal,deptno from emp where deptno=(select deptno from emp where ename = 'SCOTT') --多行子查询 select ename,sal,deptno,job from emp where job in (select distinct job from emp where deptno = 10) select ename,sal,deptno,job from emp where sal>all(select sal from emp where deptno = 30) select ename,sal from emp where deptno = 30 select ename,sal,deptno,job from emp where sal>any(select sal from emp where deptno = 30) --多列子查询 select ename,sal,deptno,job from emp where (deptno,job)=(select deptno,job from emp where ename ='SMITH') update emp set sal=1500,comm=30 where ename = 'CLARK' select ename,sal,comm from emp where ename = 'CLARK' select ename,sal,comm,deptno from emp where(sal,nvl(comm,-1)) in (select sal,nvl(comm,-1) from emp where deptno =30) select ename,sal,comm from emp where deptno=30 select ename,sal,comm,deptno from emp where sal in (select sal from emp where deptno = 30)and nvl(comm,-1)in(select nvl(comm,-1)from emp where deptno = 30)