Use count, sum, avg, median : MEDIAN « Aggregate Functions « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Aggregate Functions » MEDIAN 
12.5.2.Use count, sum, avg, median
SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;

Table created.

SQL>
SQL>
SQL> insert into employees values(1,'Jason',  'N',  'TRAINER', 2,   date '1965-12-18',  800 , NULL,  10);

row created.

SQL> insert into employees values(2,'Jerry',  'J',  'SALESREP',3,   date '1966-11-19',  1600300,   10);

row created.

SQL> insert into employees values(3,'Jord',   'T' 'SALESREP',4,   date '1967-10-21',  1700500,   20);

row created.

SQL> insert into employees values(4,'Mary',   'J',  'MANAGER', 5,   date '1968-09-22',  1800, NULL,  20);

row created.

SQL> insert into employees values(5,'Joe',    'P',  'SALESREP',6,   date '1969-08-23',  19001400,  30);

row created.

SQL> insert into employees values(6,'Black',  'R',  'MANAGER', 7,   date '1970-07-24',  2000, NULL,  30);

row created.

SQL> insert into employees values(7,'Red',    'A',  'MANAGER', 8,   date '1971-06-25',  2100, NULL,  40);

row created.

SQL> insert into employees values(8,'White',  'S',  'TRAINER', 9,   date '1972-05-26',  2200, NULL,  40);

row created.

SQL> insert into employees values(9,'Yellow', 'C',  'DIRECTOR',10,  date '1973-04-27',  2300, NULL,  20);

row created.

SQL> insert into employees values(10,'Pink',  'J',  'SALESREP',null,date '1974-03-28',  24000,     30);

row created.

SQL>
SQL>
SQL>
SQL>
SQL> select e.deptno
  2  ,      count(e.job)
  3  ,      sum(e.comm)
  4  ,      avg(e.msal)
  5  ,      median(e.msal)
  6  from   employees e
  7  group  by e.deptno;

    DEPTNO COUNT(E.JOBSUM(E.COMMAVG(E.MSALMEDIAN(E.MSAL)
---------- ------------ ----------- ----------- --------------
        10            2         300        1200           1200
        20            3         500  1933.33333           1800
        30            3        1400        2100           2000
        40            2                    2150           2150

SQL>
SQL>
SQL> drop table employees;

Table dropped.

SQL>
12.5.MEDIAN
12.5.1.MEDIAN(x) returns the median value of x.
12.5.2.Use count, sum, avg, median
12.5.3.Get median salary
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