Difference between rank and dense_rank Oracle

What is the difference between RANK and DENSE_RANK functions in Oracle ?

In simple words both does the same except RANK skips if there is a tie and DENSE_RANK does not. So remember to use DENSE_RANK to use in Nth largest queries.

Detailed explanation of RANK and DESNSE_RANK given in another posts

RANK Function

DENSE_RANK Function

Example :-

Consider below emp table data

select empno,salary,
rank() over(order by salary asc) “rank”,
dense_rank() over(order by salary asc) “dense_rank”
from emp;

See the result

RANK function skips number 8 while DENSE_RANK does not.