How To Create User Defined Functions with Parameters in SQL Server Transact-SQL?

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

⇒ Passing Values to User Defined Function Parameters in SQL Server

⇐ "ALTER FUNCTION" - Modifying Existing Functions in SQL Server

⇑ Using User Defined Functions in SQL Server Transact-SQL

⇑⇑ SQL Server Transact-SQL Tutorials