IF NOT EXISTS For Sql Functions

You must have used IF NOT EXISTS for DML operation, but the same method doesn't work for sql function.

In this tutorial I'm gonna show you how to use IF NOT EXISTS to create a function if it is already not created.

Download .Sql file for this project from HERE
 
IF EXISTS (SELECT * FROM [dbo].[sysobjects]
           WHERE ID = object_id(N'[dbo].[myfunction]')
                 )
    DROP FUNCTION [dbo].[myfunction]
GO

create function myfunction()
 returns int
 as
   begin
       return 5+4;
   end   

The idea here is to check if the function exists, if it exists than we will first drop it, and after that we can create the function.

I hope it was informative for you and I would like to Thank you for reading.