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> 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> 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> set null null
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> drop table employees;
Table dropped.
SQL>