Calculation between column from different tables : Table Alias « Table Joins « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
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 salgrades
  2  ( grade      NUMBER(2)
  3  , lowerlimit NUMBER(6,2)
  4  , upperlimit NUMBER(6,2)
  5  , bonus      NUMBER(6,2)
  6  ) ;

Table created.

SQL>
SQL>
SQL> insert into salgrades values (1,  700,1200,   0);

1 row created.

SQL> insert into salgrades values (2, 1201,1400,  50);

1 row created.

SQL> insert into salgrades values (3, 1401,2000, 100);

1 row created.

SQL> insert into salgrades values (4, 2001,3000, 200);

1 row created.

SQL> insert into salgrades values (5, 3001,9999, 500);

1 row created.

SQL>
SQL>
SQL>
SQL> select e.ename           employee
  2  ,      12*e.msal+s.bonus total_salary
  3  from   employees e
  4  ,      salgrades s
  5  where  e.msal between s.lowerlimit
  6                    and s.upperlimit;

EMPLOYEE TOTAL_SALARY
-------- ------------
Jason            9600
Jerry           19300
Jord            20500
Mary            21700
Joe             22900
Black           24100
Red             25400
White           26600
Yellow          27800
Pink            29000

10 rows selected.

SQL>
SQL>
SQL> drop table employees;

Table dropped.

SQL>
SQL> drop table salgrades;

Table dropped.

SQL>