Reference one column more than once : Columns « Query Select « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. Query Select
3. Columns

SQL> create table product(
  2          product_id          integer     primary key
  3          ,price                  number(7,2)
  4          ,description            varchar2(75)
  5          ,onhand                 number(5,0)
  6          ,reorder                number(5,0)
  7          ,supplier_no            integer
  8  );

Table created.

SQL> -- product Table Inserts:
SQL> insert into product(product_id, price, description, onhand, reorder)values (1,2.50,'Happy Birthday',100,20);

1 row created.

SQL> insert into product(product_id, price, description, onhand, reorder)values (2,23.00,'Happy Birthday',null,null);

1 row created.

SQL> insert into product(product_id, price, description, onhand, reorder)values (3,null,'Happy New Year',null,null);

1 row created.

SQL> insert into product(product_id, price, description, onhand, reorder)values (4,1.50,'Happy New Year',50,10);

1 row created.

SQL>
SQL>
SQL> select description, price, price * .068 as tax,
  2         price * 1.068 as "Total"
  3    from product;

DESCRIPTION
---------------------------------------------------------------------------
     PRICE        TAX      Total
---------- ---------- ----------
Happy Birthday
       2.5        .17       2.67

Happy Birthday
        23      1.564     24.564

Happy New Year


Happy New Year
       1.5       .102      1.602


4 rows selected.

SQL>
SQL> drop table product;

Table dropped.