Analytical Function:-

return the infornation that about the relative possition of record (ROW_NUMBER,Rank,DENSE_RANK) and allow to campare with succesor and precedessors when they sort in spacific order.

select ename, deptno, sal, hiredate, row_number() over ( partition by deptno order by sal desc, comm desc , hiredate desc
) sal_rank_in_dept, row_number() over (order by sal desc) sal_rank_overall
from emp
order
by deptno
, sal desc
, comm desc
, hiredate desc

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