Slide 14.19: Aliases

Slide 14.18: The BETWEEN operator
Slide 14.20: The UNION command
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Aliases

With SQL, aliases can be used for column names and table names.

LastName	FirstName	Address	City
Hansen	Ola	Timoteivn 10	Sandnes
Svendson	Tove	Borgvn 23	Sandnes
Pettersen	Kari	Storgt 20	Stavanger

Table Name Alias
The syntax is on the right:

 SELECT  column
   FROM  table AS table_alias

 SQL> select  LastName, FirstName
   2    from  Persons as Employees;

The table on the right is Employees.

LastName	FirstName
Hensen	Ola
Svendson	Tove
Pettersen	Kari

Column Name Alias
The syntax is on the right:

 SELECT  column AS column_alias
   FROM  table

 SQL> select  LastName as Family,
   2      FirstName as Name
   3    from  Persons;

Family	Name
Hensen	Ola
Svendson	Tove
Pettersen	Kari

The following is an SQL test area from w3schools.com where the Customers table may be created by the following command:

   SQL> create table  Customers (
     2    CustomerID   varchar(16),
     3    CompanyName  varchar(32),
     4    ContactName  varchar(32),
     5    Address      varchar(64),
     6    City         varchar(32),
     7    PostalCode   varchar(16),
     8    Country      varchar(32) );

Note that the Customers table is for read only.