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SQL Server FAQ - Using User Defined Functions in Expressions
(Continued from previous topic...)
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:
-- Calling a function without schema name
PRINT 'Hi there, '+Welcome();
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();
Hi there, Welcome to FYIcenter.com
(Continued on next topic...)
- What Are User Defined Functions?
- What Are the Differences between User Defined Functions and Stored Procedures?
- How To Create a Simple User Defined Function?
- How To Use User Defined Functions in Expressions?
- How To List All User Defined Functions in the Current Database?
- How To Drop an Existing User Defined Function?
- How To Generate CREATE FUNCTION Script on an Existing Function?
- How To Get the Definition of a User Defined Function Back?
- How To Modify an Existing User Defined Function?
- How To Create User Defined Functions with Parameters?
- How To Provide Values to User Defined Function Parameters?
- Can You Pass Expressions to Function Parameters?
- How To Provide Default Values to Function Parameters?
- How Many Categories of Functions based Their Return Modes?
- How Many Ways to Create Table-Valued Functions?
- How To Create an Inline Table-Valued Function?
- How To Create an Multi-Statement Table-Valued Function?