What s the difference between RANK and DENSE RANK functions in oracle

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What distinguishes the functions RANK() and DENSE RANK()? In the following emptbl table, how can I determine the nth salary?

DEPTNO  EMPNAME    SAL
------------------------------
10       rrr    10000.00
11       nnn    20000.00
11       mmm    5000.00
12       kkk    30000.00
10       fff    40000.00
10       ddd    40000.00
10       bbb    50000.00
10       ccc    50000.00

If in the table data having nulls, what will happen if I want to find out nth salary?

Aug 22 in Database by Kithuzzz
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