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SQL Alias
Posted on: December 20, 2008 at 12:00 AM

Alias name is given to table and column. In SQL we can give a table or column another name by using an Alias.

SQL Alias

Alias name is given to table and column. In SQL we can give a table or column another name by using an Alias. The Alias help you to make your complicated table and column name simpler and sorter.

Understand with Example

The Tutorial illustrate an example to understand SQL Alias. In this example, before understanding Alias, we create a tables 'Stu_Table'and 'Lib_Table' using create table statement.

Create Table Stu_Table

create table Stu_Table(Stu_Id integer(2), Stu_Name varchar(15), Stu_Class  varchar(10));

Create Table Lib_Table

create table Lib_Table(Stu_Id integer(2), Lib_no integer(5));

Insert data into Stu_Table

The insert into add the records value into your respective tables.

insert into Stu_Table values(1,'Komal',10);
insert into Stu_Table values(2,'Ajay',10);
insert into Stu_Table values(3,'Rakesh',10);
insert into Stu_Table values(4,'Bhanu',10);
insert into Stu_Table values(5,'Santosh',10);

Insert data into Lib_Table

insert into Lib_Table values(1,101);
insert into Lib_Table values(2,102);
insert into Lib_Table values(3,103);
insert into Lib_Table values(4,104);
insert into Lib_Table values(5,105)

Stu_Table

Stu_Id	Stu_Name	Stu_Class
1	Komal	10
2	Ajay	10
3	Rakesh	10
4	Bhanu	10
5	Santosh	10

Lib_Table

Stu_Id	Lib_no
1	101
2	102
3	103
4	104
5	105

SQL Alias Query

The given below example show you the SQL Alias Query. In this case, the alias name for Stu_Table is 's' and Lib_Table is 'l'.As you can see the Alias Name Query make the table name simple and easier to write and read.

select s.stu_id, s.stu_name, s.stu_class, l.lib_no 
from Stu_Table as s , Lib_Table as l
where s.stu_id = l.stu_id

Result

Stu_Id	Stu_Name	Stu_Class	Lib_no
1	Komal	10	101
2	Ajay	10	102
3	Rakesh	11	103
4	Bhanu	11	104
5	Santosh	12	105

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