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SQL Server FAQ - "CREATE FUNCTION" - Creating User Defined Functions

By: FYIcenter.com

(Continued from previous topic...)

How To Create a Simple User Defined Function?

If you want to create a simple user defined function, you can use the "CREATE FUNCTION" command with a statement block in a simple format as shown in below:

CREATE FUNCTION function_name() 
   RETURNS data_type
   AS BEGIN
      statement_1;
      statement_2;
      ...
      statement_n;
      RETURN expression;
   END;
GO

The following tutorial exercise shows you how to create a simple user defined function:

USE FyiCenterData;
GO

CREATE FUNCTION Welcome()
   RETURNS VARCHAR(40)
   AS BEGIN
      RETURN 'Welcome to FYIcenter.com';
   END;
GO

PRINT dbo.Welcome();
GO
Welcome to FYIcenter.com

(Continued on next topic...)

1. What Are User Defined Functions?
2. What Are the Differences between User Defined Functions and Stored Procedures?
3. How To Create a Simple User Defined Function?
4. How To Use User Defined Functions in Expressions?
5. How To List All User Defined Functions in the Current Database?
6. How To Drop an Existing User Defined Function?
7. How To Generate CREATE FUNCTION Script on an Existing Function?
8. How To Get the Definition of a User Defined Function Back?
9. How To Modify an Existing User Defined Function?
10. How To Create User Defined Functions with Parameters?
11. How To Provide Values to User Defined Function Parameters?
12. Can You Pass Expressions to Function Parameters?
13. How To Provide Default Values to Function Parameters?
14. How Many Categories of Functions based Their Return Modes?
15. How Many Ways to Create Table-Valued Functions?
16. How To Create an Inline Table-Valued Function?
17. How To Create an Multi-Statement Table-Valued Function?