set null " [N/A]" : null « SQL PLUS Session Environment « Oracle PL/SQL Tutorial

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2. SQL PLUS Session Environment
3. null

SQL>
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);

1 row created.

SQL> insert into employees values(2,'Jerry',  'J',  'SALESREP',3,   date '1966-11-19',  1600, 300,   10);

1 row created.

SQL> insert into employees values(3,'Jord',   'T' , 'SALESREP',4,   date '1967-10-21',  1700, 500,   20);

1 row created.

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

1 row created.

SQL> insert into employees values(5,'Joe',    'P',  'SALESREP',6,   date '1969-08-23',  1900, 1400,  30);

1 row created.

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

1 row created.

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

1 row created.

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

1 row created.

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

1 row created.

SQL> insert into employees values(10,'Pink',  'J',  'SALESREP',null,date '1974-03-28',  2400, 0,     30);

1 row created.

SQL>
SQL>
SQL>
SQL> set null " [N/A]"
SQL>
SQL> select * from employees;

 EMPNO      last_name       INIT  JOB         MGR BDATE        MSAL DEPTNO
------ -------------------- ----- -------- ------ ---------- ------ ------
     1 Jason                N     TRAINER       2 18-12-1965    800     10
     2 Jerry                J     SALESREP      3 19-11-1966   1600     10
     3 Jord                 T     SALESREP      4 21-10-1967   1700     20
     4 Mary                 J     MANAGER       5 22-09-1968   1800     20
     5 Joe                  P     SALESREP      6 23-08-1969   1900     30
     6 Black                R     MANAGER       7 24-07-1970   2000     30
     7 Red                  A     MANAGER       8 25-06-1971   2100     40

 EMPNO      last_name       INIT  JOB         MGR BDATE        MSAL DEPTNO
------ -------------------- ----- -------- ------ ---------- ------ ------
     8 White                S     TRAINER       9 26-05-1972   2200     40
     9 Yellow               C     DIRECTOR     10 27-04-1973   2300     20
    10 Pink                 J     SALESREP  [N/A] 28-03-1974   2400     30

10 rows selected.

SQL>
SQL>
SQL> set null null
SQL>
SQL>
SQL> select * from employees;

 EMPNO      last_name       INIT  JOB         MGR BDATE        MSAL DEPTNO
------ -------------------- ----- -------- ------ ---------- ------ ------
     1 Jason                N     TRAINER       2 18-12-1965    800     10
     2 Jerry                J     SALESREP      3 19-11-1966   1600     10
     3 Jord                 T     SALESREP      4 21-10-1967   1700     20
     4 Mary                 J     MANAGER       5 22-09-1968   1800     20
     5 Joe                  P     SALESREP      6 23-08-1969   1900     30
     6 Black                R     MANAGER       7 24-07-1970   2000     30
     7 Red                  A     MANAGER       8 25-06-1971   2100     40

 EMPNO      last_name       INIT  JOB         MGR BDATE        MSAL DEPTNO
------ -------------------- ----- -------- ------ ---------- ------ ------
     8 White                S     TRAINER       9 26-05-1972   2200     40
     9 Yellow               C     DIRECTOR     10 27-04-1973   2300     20
    10 Pink                 J     SALESREP null   28-03-1974   2400     30

10 rows selected.

SQL>
SQL>
SQL> drop table employees;

Table dropped.

SQL>