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SQL Alias

                         

SQL Alias is the another name given to the existing table and the column. The SQL Alias make the table and column name easy to read and write.

Understand with Example

The Tutorial illustrate a example from 'SQL Alias'. To grasp this example, we create a table 'Stu_Table'. The create table is used to create a table 'Stu_Table' and 'Lib_Table' that include field attribute and data type respectively.

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 or rows to the table 'Stu_Table' and 'Lib_Table'.

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 SQL Query takes alias name for table 'Stu_Table' as s and 'Lib_Table' as l.

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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