Table Variable in Stored Procedure

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Table Variable in Stored Procedure

PJ_SQL

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July 29, 2015 at 3:19 pm

#302956

What is the purpose of creating table variable and inserting data into it and selecting from table variable inside of stored proc?
Why can't the stored proc just have select statement instead of creating table variable?

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WayneS SSC Guru Points: 95409 More actions · Answer 1

PJ_SQL (7/29/2015)
What is the purpose of creating table variable and inserting data into it and selecting from table variable inside of stored proc?
Why can't the stored proc just have select statement instead of creating table variable?

If all that you are doing is selecting into the Table Variable (TV), and then promptly selecting out, then you are absolutely right. It would be better to just select the data directly, and the stored procedure does not require using the TV.

A TV (or temp table) is frequently used in a procedure to break up the code into simpler, smaller routines. They are especially useful when you might have to call use those results multiple times in the procedure.

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes

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drew.allen SSC Guru Points: 76948 More actions · Answer 2

Another reason is that you might be storing information from an OUTPUT clause to use later, especially if you want to use information from both the INSERTED and DELETED temporary tables.

Drew

J. Drew Allen
Business Intelligence Analyst
Philadelphia, PA

TheSQLGuru SSC Guru Points: 134017 More actions · Answer 3

PJ_SQL (7/29/2015)
What is the purpose of creating table variable and inserting data into it and selecting from table variable inside of stored proc?
Why can't the stored proc just have select statement instead of creating table variable?

Most of the times I have seen this at clients it was because of developers who had no idea what they were doing. One client in fact had this pattern in about 90% of there over 2000 stored procedures!! Quite silly, but it made me look pretty good when they removed them at my recommendation. 😎

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Kevin G. Boles
SQL Server Consultant
SQL MVP 2007-2012
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