RANK() and PARTITION BY

PARTITION BY divides the groups into subgroups.


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 deptno, SUM(sal),
  2  RANK() OVER (PARTITION BY deptno ORDER BY SUM(sal) DESC) AS rank
  3  FROM emp
  4  GROUP BY deptno
  5  ORDER BY deptno;

    DEPTNO   SUM(SAL)       RANK
---------- ---------- ----------
        10       5850          1
        20       8275          1
        30       8450          1

SQL>
SQL>
Home »
Oracle »
Analytical Functions » 

RANK:
  1. RANK
  2. Place NULLS FIRST in RANK
  3. Place NULLS LAST in RANK
  4. Place NULLS LAST in RANK and order by clause
  5. Get top n rows with rank
  6. Using the RANK with group by
  7. RANK() vs DENSE_RANK() Functions
  8. RANK() and PARTITION BY
  9. ROLLUP and RANK
  10. CUBE and RANK
  11. GROUPING SETS and RANK
Related: