DENSE_RANK

DENSE_RANK function calculates row number and does not skip rank if there is a tie. Its general format:

DENSE_RANK over (analytical clause)

analytical clause could be

  • ordering
  • partitioning
  • windowing
  • or the combination of above three

CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
                  ENAME VARCHAR2(10),
                  JOB VARCHAR2(9),
                  SAL NUMBER(7, 2),
                  DEPTNO NUMBER(2));

INSERT INTO EMP VALUES (1, 'SMITH', 'CLERK',     800,    20);
INSERT INTO EMP VALUES (2, 'ALLEN', 'SALESMAN', 1600,    30);
INSERT INTO EMP VALUES (3, 'WARD',  'SALESMAN', 1250,    30);
INSERT INTO EMP VALUES (4, 'JONES', 'MANAGER',  2975,    20);
INSERT INTO EMP VALUES (5, 'MARTIN','SALESMAN', 1250,    30);
INSERT INTO EMP VALUES (6, 'BLAKE', 'MANAGER',  2850,    30);
INSERT INTO EMP VALUES (7, 'CLARK', 'MANAGER',  2850,    10);
INSERT INTO EMP VALUES (8, 'SCOTT', 'ANALYST',  3000,    20);
INSERT INTO EMP VALUES (9, 'KING',  'PRESIDENT',3000,    10);
INSERT INTO EMP VALUES (10,'TURNER','SALESMAN', 1500,    30);
INSERT INTO EMP VALUES (11,'ADAMS', 'CLERK',    1500,    20);

SQL> select ename,
  2         sal,
  3         DENSE_rank() over (order by sal) toprank from emp;

ENAME             SAL    TOPRANK
---------- ---------- ----------
SMITH             800          1
WARD             1250          2
MARTIN           1250          2
TURNER           1500          3
ADAMS            1500          3
ALLEN            1600          4
CLARK            2850          5
BLAKE            2850          5
JONES            2975          6
KING             3000          7
SCOTT            3000          7

11 rows selected.

SQL>
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DENSE_RANK:
  1. DENSE_RANK
  2. Place NULLS FIRST in DENSE_RANK
  3. Place NULLS LAST in DENSE_RANK
  4. Get top n rows with dense_rank
  5. Using the DENSE_RANK with group by
  6. Using DENSE_RANK and RANK together
  7. DENSE_RANK() and PARTITION BY
  8. ROLLUP and DENSE_RANK
  9. CUBE and DENSE_RANK
  10. GROUPING SETS and DENSE_RANK
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