Natural join two tables : natural join « Table Joins « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. Table Joins
3. natural join

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> create table history
  2  ( empno      NUMBER(4)
  3  , beginyear  NUMBER(4)
  4  , begindate  DATE
  5  , enddate    DATE
  6  , deptno     NUMBER(2)
  7  , msal       NUMBER(6,2)
  8  , comments   VARCHAR2(60)
  9  ) ;

Table created.

SQL>
SQL>
SQL>
SQL> insert into history values (9,2000,date '2000-01-01',date '2002-01-02',40, 950,'history for 9');

1 row created.

SQL> insert into history values (8,2000,date '2000-01-02', NULL       ,20, 800,'');

1 row created.

SQL> insert into history values (7,1988,date '2000-01-06',date '2002-01-07',30,1000,'');

1 row created.

SQL> insert into history values (6,1989,date '2000-01-07',date '2002-01-12',30,1300,'');

1 row created.

SQL> insert into history values (5,1993,date '2000-01-12',date '2002-01-10',30,1500,'history for 5');

1 row created.

SQL> insert into history values (4,1995,date '2000-01-10',date '2002-01-11',30,1700,'');

1 row created.

SQL> insert into history values (3,1999,date '2000-01-11', NULL       ,30,1600,'');

1 row created.

SQL> insert into history values (2,1986,date '2000-01-10',date '2002-01-08',20,1000,'history for 2');

1 row created.

SQL> insert into history values (1,1987,date '2000-01-08',date '2002-01-01',30,1000,'history for 1');

1 row created.

SQL> insert into history values (7,1989,date '2000-01-01',date '2002-05-12',30,1150,'history for 7');

1 row created.

SQL>
SQL>
SQL>
SQL> select ename, beginyear, msal, deptno
  2  from   employees
  3         natural join
  4         history;

no rows selected

SQL>
SQL> drop table history;

Table dropped.

SQL>
SQL> drop table employees;

Table dropped.

SQL>