NTILE

NTILE groups data by putting data into a number of percentile groups. For example, to know the salaries in each 25%(top 25%, middle 25%, next 25% and bottom 25%).


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 empno, ename, sal, NTILE(4) over (order by sal)
  2  from emp;

     EMPNO ENAME             SAL NTILE(4)OVER(ORDERBYSAL)
---------- ---------- ---------- ------------------------
         1 SMITH             800                        1
         3 WARD             1250                        1
         5 MARTIN           1250                        1
        10 TURNER           1500                        2
        11 ADAMS            1500                        2
         2 ALLEN            1600                        2
         7 CLARK            2850                        3
         6 BLAKE            2850                        3
         4 JONES            2975                        3
         9 KING             3000                        4
         8 SCOTT            3000                        4

11 rows selected.

SQL>

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