User Defined Functions | SQL Server | SQL Tutorial
Routines in SQL Server :
A stored routine is a set of SQL statements that can be stored in the server. Once this has been done, we don't need to keep reissuing the individual statements but can refer to the stored routine instead.
User Defined Functions:
The Purpose of User defined function is to encapsulate logic that calculates something, possibly based on input parameters, and returns a result.
SQL Server Supports Scalar and Table - valued User Defined Functions.
Scalar Function returns single value where as Table valued function returns a table.
Scalar UDFs can be used anywhere in query like SELECT .
Table valued Function can be used in from clause of the query.
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