oracle的子查询中使用some,any和all

Some和any表示满足其中一个的意义,一般来讲some用在“=”的比较从句中.  All则表示满足其其中所有的查询结果的含义.

select ename,sal
From emp
Where sal > any(select sal from emp where deptno = 10);

select ename,sal
From emp
Where sal > some(select sal from emp where deptno = 10);

select ename,sal
From emp
Where sal > all(select sal from emp where deptno = 20);

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