sql - Oracle - how to calculate sum of highest salary for each dept -

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as far get, getting max sal of each dept: 

select ename, sal, deptno emp out sal = (   select max(sal) emp inside   out.deptno=inside.deptno );

this returns 4 results, want sum of 4 results, how do that? seems not work: 

select ename, sum(sal), deptno emp out group deptno, sal, ename having sum(sal) = (   select max(sal) emp inside   out.deptno=inside.deptno );

it returning same result first query.

select sum(max_sal) total_sum  (   select deptno, max(sal) max_sal   emp   group deptno ) x

to highest salary every department can group department , use max() highest. use subquery sum these up.


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