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SQL Server FAQ - Creating User Defined Functions with Parameters

By: FYIcenter.com

(Continued from previous topic...)

How To Create User Defined Functions with Parameters?

Very often, you need to create a function with one or more parameters so that the function can be more generic. You only supply values to those parameters at the time of executing the function.

User defined functions with parameters can be created with the following syntax:

CREATE FUNCTION function_name (
   @parameter_1 data_type, 
   @parameter_2 data_type, 
   ...
   @parameter_n data_type
   )
RETURNS data_type
AS BEGIN
   statement_1;
   statement_2;
   ...
   statement_n;
END;

The following tutorial exercise shows you how to create a function with one parameter called @url:

USE FyiCenterData;
GO

DROP FUNCTION Welcome;
GO

CREATE FUNCTION Welcome(@url VARCHAR(40))
   RETURNS VARCHAR(40)
   AS BEGIN
      RETURN 'Welcome to '+@url;
   END;
GO

PRINT 'Hi there, '+dbo.Welcome('dba.FYIcenter.com');
GO
Hi there, Welcome to dba.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?

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