What is an ALIAS command in SQL Server, where apply alias in the database command?

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Ashutosh Kumar Verma · Answer

SQL Aliases : 
SQL aliases are used to give a temporary name to tables or columns in table. It is exist only duration of that query in perform. Alias are used to provide a easier name to table or column of table. An alias is create with use of ‘AS’ keyword.
Syntax : 
Alias for column- 
SELECT column_name AS alias_name FROM table_name;
We can also create alias for multiple column in a table. 
SELECT column1 AS alias1, column2 AS alias2 ,… FROM table_name ;
Alias for Table- 
SELECT colum1,column2,… FROM table_name AS alias_name ;
Example : 
Lets have a table ‘Customer’, 
Follow the statement is used alias for table column ‘cust_name’ as ‘name’ and ‘city’ as ‘c’ .
select cust_name as name, city as c from Customer;
The following SQL statement is using alias for a table ‘Customer’ as ‘cust’. 
select cust.cust_name,cust.city,cust.customer_id from Customer as cust;
We can also provide aliases to retrieve record from more than one table at a time like below.
select cust.cust_name,cust.city,cust.customer_id, sale.salesman_id, sale.name 
from Customer as cust,Salesman as sale where cust.salesman_id=sale.salesman_id;
We can also provide single alias for two or more columns in a table at a time. In the following statement a alias ‘name’ for column name ‘cust_name’ and ‘city’ in ‘Customer’ table.
and select customer_id, cust_nameand#43;','and#43;city as name from Customer;
To give space between alias name use [alias name] in SQL statement. 
select customer_id, cust_nameand#43;' , 'and#43;city as [name  address] from Customer;
In the following statement select a record where customer_id=3007(Brad Davis). By using ‘Customer’ and ‘Salesman’ table and give the alias name as ‘cust’ and ‘sale’ respectively.
select cust.customer_id, cust.cust_name,sale.salesman_id,sale.name 
from Customer as cust, Salesman as sale 
where cust.cust_name='Brad Davis' AND cust.salesman_id=sale.salesman_id;

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What is an ALIAS command in SQL Server, where apply alias in the database command?

Ravi Vishwakarma

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