T-SQL Columns, Tables Alias

In SQL, we can alias columns, views and tables. A table alias is also called a co-relation name.

It is a temporarily names of columns or tables.

The Alias temporarily assigns another name to a column, or table at the time of a SELECT query and the assigning alias doesn’t rename the column or table name actually!

Basically, it make column, or table more readable to the programmers.

Syntax:

--USE OF TABLE ALIAS
SELECT TBL.Id, TBL.Name 
    FROM [dbo].[Tbl_Demo] AS TBL
WHERE TBL.Id in (1, 2, 3) 

--USE OF COLUMN ALIAS
SELECT TBL.Id AS UID, TBL.Name AS UNAME
    FROM [dbo].[Tbl_Demo] AS TBL
WHERE TBL.Id in (1, 2, 3)