Getting started with Microsoft SQL Server OVER Clause PIVOT / UNPIVOT Database Snapshots Retrieve information about the database The STUFF Function FOR XML PATH Cursors Join Common Table Expressions Move and copy data around tables Dates Limit Result Set Retrieve Information about your Instance With Ties Option Variables JSON in Sql Server Window functions Partitioning Stored Procedures GROUP BY Generating a range of dates COALESCE Split String function in Sql Server INSERT INTO CREATE VIEW String Functions Resource Governor ORDER BY WHILE loop System database - TempDb Migration Primary Keys MERGE Full-Text Indexing FOR JSON SELECT statement DBMAIL Index Queries with JSON data Storing JSON in SQL tables OPENJSON Ranking Functions Trigger Converting data types NULLs Transaction isolation levels Advanced options IF...ELSE TRY/CATCH Data Types User Defined Table Types Table Valued Parameters In-Memory OLTP (Hekaton)Temporal Tables Insert Sequences SCOPE_IDENTITY()Views Use of TEMP Table Scheduled Task or Job Isolation levels and locking Sorting/ordering rows Privileges or Permissions Foreign Keys SQLCMD File Group cross apply Basic DDL Operations in MS SQL Server Computed Columns UNION Subqueries Last Inserted Identity CLUSTERED COLUMNSTORE Parsename Installing SQL Server on Windows Aggregate Functions Querying results by page Schemas Backup and Restore Database Transaction handling Natively compiled modules (Hekaton)Database permissions Spatial Data Dynamic SQL Pagination Query Hints Modify JSON text Row-level security Dynamic data masking Export data in txt file by using SQLCMD Encryption Managing Azure SQL Database Common Language Runtime Integration Delimiting special characters and reserved words CASE Statement DBCC BULK Import Query Store Service broker Analyzing a Query Microsoft SQL Server Management Studio Shortcut Keys Permissions and Security PHANTOM read Filestream Drop Keyword String Aggregate functions in SQL Server SQL Server Evolution through different versions (2000 - 2016)SQL Server Management Studio (SSMS)Logical Functions Dynamic SQL Pivot Alias Names in Sql Server bcp (bulk copy program) Utility

Alias Names in Sql Server

Giving alias after Derived table name

This is a weird approach most of the people don't know this even exist.

CREATE TABLE AliasNameDemo(id INT,firstname VARCHAR(20),lastname VARCHAR(20)) 

INSERT INTO AliasNameDemo
VALUES      (1,'MyFirstName','MyLastName') 

SELECT * 
FROM   (SELECT firstname + ' ' + lastname 
        FROM   AliasNameDemo) a (fullname)

Demo

Using AS

This is ANSI SQL method works in all the RDBMS. Widely used approach.

CREATE TABLE AliasNameDemo (id INT,firstname VARCHAR(20),lastname VARCHAR(20)) 

INSERT INTO AliasNameDemo
VALUES      (1,'MyFirstName','MyLastName') 

SELECT FirstName +' '+ LastName As FullName
FROM   AliasNameDemo

Using =

This is my preferred approach. Nothing related to performance just a personal choice. It makes the code to look clean. You can see the resulting column names easily instead of scrolling the code if you have a big expression.

CREATE TABLE AliasNameDemo (id INT,firstname VARCHAR(20),lastname VARCHAR(20)) 

INSERT INTO AliasNameDemo
VALUES      (1,'MyFirstName','MyLastName') 

SELECT FullName = FirstName +' '+ LastName
FROM   AliasNameDemo

Without using AS

This syntax will be similar to using AS keyword. Just we don't have to use AS keyword

CREATE TABLE AliasNameDemo (id INT,firstname VARCHAR(20),lastname VARCHAR(20)) 

INSERT INTO AliasNameDemo
VALUES      (1,'MyFirstName','MyLastName') 

SELECT FirstName +' '+ LastName FullName
FROM   AliasNameDemo

Contributors

Topic Id: 10784

Example Ids: 32328,32326,32327,32329

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