List table from two tables and specifying its column owner : Table Alias « Table Joins « Oracle PL/SQL Tutorial

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2. Table Joins
3. Table Alias

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> create table departments
  2  ( deptno NUMBER(2)
  3  , dname  VARCHAR2(10)
  4  , location VARCHAR2(20)
  5  , mgr    NUMBER(4)
  6  ) ;

Table created.

SQL>
SQL> insert into departments values (10,'ACCOUNTING','NEW YORK' ,  2);

1 row created.

SQL> insert into departments values (20,'TRAINING',  'VANCOUVER',  3);

1 row created.

SQL> insert into departments values (30,'SALES',     'CHICAGO',    4);

1 row created.

SQL> insert into departments values (40,'HR',        'BOSTON',     5);

1 row created.

SQL>
SQL>
SQL>
SQL> select d.deptno, d.location, e.ename, e.init
  2  from   employees e, departments d;

    DEPTNO LOCATION             ENAME    INIT
---------- -------------------- -------- -----
        10 NEW YORK             Jason    N
        10 NEW YORK             Jerry    J
        10 NEW YORK             Jord     T
        10 NEW YORK             Mary     J
        10 NEW YORK             Joe      P
        10 NEW YORK             Black    R
        10 NEW YORK             Red      A
        10 NEW YORK             White    S
        10 NEW YORK             Yellow   C
        10 NEW YORK             Pink     J
        20 VANCOUVER            Jason    N
        20 VANCOUVER            Jerry    J
        20 VANCOUVER            Jord     T
        20 VANCOUVER            Mary     J
        20 VANCOUVER            Joe      P
        20 VANCOUVER            Black    R
        20 VANCOUVER            Red      A
        20 VANCOUVER            White    S
        20 VANCOUVER            Yellow   C
        20 VANCOUVER            Pink     J
        30 CHICAGO              Jason    N
        30 CHICAGO              Jerry    J
        30 CHICAGO              Jord     T
        30 CHICAGO              Mary     J
        30 CHICAGO              Joe      P
        30 CHICAGO              Black    R
        30 CHICAGO              Red      A
        30 CHICAGO              White    S
        30 CHICAGO              Yellow   C
        30 CHICAGO              Pink     J
        40 BOSTON               Jason    N
        40 BOSTON               Jerry    J
        40 BOSTON               Jord     T
        40 BOSTON               Mary     J
        40 BOSTON               Joe      P
        40 BOSTON               Black    R
        40 BOSTON               Red      A
        40 BOSTON               White    S
        40 BOSTON               Yellow   C
        40 BOSTON               Pink     J

40 rows selected.

SQL>
SQL> drop table employees;

Table dropped.

SQL>
SQL> drop table departments;

Table dropped.