select t1.deptno,t2.dName,t1.ename,t1.sal from
(
select deptno,ename,sal
from (select deptno,ename,sal,row_number() over(partition by deptno order by sal)rn
from emp)
where rn <=3) t1 left join dept t2 on t2.deptno=t1.deptno
select t1.deptno,t2.dName,t1.ename,t1.sal from
(
select deptno,ename,sal
from (select deptno,ename,sal,row_number() over(partition by deptno order by sal)rn
from emp)
where rn <=3) t1 left join dept t2 on t2.deptno=t1.deptno