SQL Server FAQ - Using User Defined Functions in Expressions

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By: FYIcenter.com

How To Use User Defined Functions in Expressions?

An user defined function must return a value, which can be used in any expression as long as the return value data type matches the expression.

To execute a user defined function and use its return value in an expression, you just need to enter the schema name and the function name as a value in the expression. The tutorial exercise below shows you how use a user defined function in an expression:

USE FyiCenterData;
GO

-- Calling a function without schema name
PRINT 'Hi there, '+Welcome();
GO
Msg 195, Level 15, State 10, Line 1
'Welcome' is not a recognized built-in function name.

-- Calling a function with schema name 
PRINT 'Hi there, '+dbo.Welcome();
GO
Hi there, Welcome to FYIcenter.com

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