SQL Server Interview Questions on Function and Stored Procedure

Q : What is the difference between a User Defined Function (UDF) and a Stored Procedure (SP) in SQL Server

Ans : 1. Stored Procedure support deffered name resolution where as functions do not support deffered name resolution.

2. User Defined Function can be used in a select statement where as you cannot use a stored procedure in a select statement.

3. UDF's cannot return Image, Text where as a StoredProcedure can return any datatype.

4. In general User Defined Functions are used for computations where as Stored Procedures are used for performing business logic.

5. UDF should return a value where as Stored Procedure need not.

6. User Defined Functions accept lesser number of input parameters than Stored Procedures. UDF can have upto 1023 input parameters where as a Stored Procedure can have upto 21000 input parameters.

7. Temporary Tables can not be used in a UDF where as a StoredProcedure can use Temporary Tables.

8. UDF can not Execute Dynamic SQL where as a Stored Procedure can execute Dynamic SQL.

9. User Defined Function does not support error handling where as Stored Procedure support error handling. RAISEERROR or @@ERROR are not allowed in UDFs.

If you are aware of any other differences, please post them as comments, so that they will be useful for others.

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