Using key word ALL for sub-query

Question

I don't quite understand the ALL funciton.
Would anyone please explain it.
select e.empno, e.ename, e.job, e.salary from employee e
where e.salary > ALL (select x.salary from employee x
where x.job = 'Engineer');

Answer 1

>
Example:
select e.empno, e.ename, e.job, e.salary from employee e
where e.salary > ALL (select x.salary from employee x
where x.job = 'Engineer');
Let´s assume that the subquery have this values: 1000, 2000, 3000, 4000.
then the result will be the people whose salary is bigger than 1000, 2000 3000 and 4000.
Got it ?Not quite - why not use as your subquery - > (SELECT MAX(x.salary) from employee x where x.job = 'Engineer')?
Paul...
Edited by: Paulie on 08-May-2012 23:41