UDFs in SQL Server

User-defined functions (UDF) allow you to add custom solutions for unique application-specific problems. Tasks can be as simple as calculating a value or as complex as defining and implementing table constraints. Technically speaking, SQL Server UDFs are subroutines of encapsulated Transact-SQL (T-SQL) logic that you can call into action via other T-SQL code to return a scalar (single) value or a table variable. more

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