Web Reference: Nov 18, 2025 · This article describes how to create a user-defined function (UDF) in SQL Server by using Transact-SQL. User-defined functions can't be used to perform actions that modify the database state. User-defined functions can't contain an OUTPUT INTO clause that has a table as its target. User-defined functions can't return multiple result sets. You will learn about SQL Server user-defined functions including scalar-valued functions and table-valued functions to simplify your development. Before you can use a udf , you must initially define it. The create function statement lets you create a udf. For example, you can code a SQL expression to compute a scalar value inside the create function statement. When some code invokes the function, the computed value is the result of the function. As with other code modules, such as stored pro...
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