PURPOSE OF TEMPORARY TABLES

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PURPOSE OF TEMPORARY TABLES

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SQLCHILD

Posted Friday, February 11, 2011 4:35 AM

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what are the main purposes for which temporary tables are used?
I want to know the uses of temporary tables in practical and commercial applications i.e. practically in working softwares.

Post #1062468

GilaMonster

Posted Friday, February 11, 2011 5:38 AM

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Temporary storage of interim result sets that will be further processed by the procedure.

Gail Shaw
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Post #1062491

Joy Smith San

Posted Friday, February 11, 2011 5:56 AM

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SQLCHILD (2/11/2011)

what are the main purposes for which temporary tables are used?
I want to know the uses of temporary tables in practical and commercial applications i.e. practically in working softwares.

Temporary tables are used if you want to hold data temporarily for certain processos to be done on that.

Post #1062499

Henry Treftz

Posted Friday, February 11, 2011 7:46 AM

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Also keep in mind SQL Server will use temp tables without you ever explicitly knowing about it.

Post #1062604

Jeff Moden

Posted Saturday, February 12, 2011 10:11 AM

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SQLCHILD (2/11/2011)

what are the main purposes for which temporary tables are used?

To go along with what Gail said above...

When used properly do "Divide'n'Conquer" a large "problem", you can get absolutely mind boggling blinding speed out of some queries. Seriously. Way too many people think that "good set based code" has to be a single query to accomplish a task and nothing could be further from the truth. I've used Temp Tables to divide up queries that have dozens of joins (typically created by an ORM or someone using a query designer) and that previous took anywhere from 45 minutes to 2 hours to run and have gotten them to run in seconds.

There are DBA's that won't allow Temp Tables to be used by developed code. It sometimes takes a bit to convince them that T-SQL will build "Work" tables in Temp DB behind the scenes but they normally come around when you show them that properly used Temp Tables can convert long running, resource greedy code that takes (sometimes) hours to run into something that takes only 3 or 4 seconds to run.

--Jeff Moden

"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

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Post #1062993

SQLCHILD

Posted Sunday, February 13, 2011 9:46 PM

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Dear Jeff Sir,

Thanks a lot for your reply, i also wanted to know that how do temporary tables hold the result set of a stored procedure. i have read about temporary tables uses and found that they are used to hold the result set of a stored procedure.
Please can you explain this with an example?

Post #1063262

SQLCHILD

Posted Sunday, February 13, 2011 9:46 PM

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Dear Sir,

Thanks a lot for your reply, i also wanted to know that how do temporary tables hold the result set of a stored procedure. i have read about temporary tables uses and found that they are used to hold the result set of a stored procedure.
Please can you explain this with an example?

Post #1063263

SQLCHILD

Posted Sunday, February 13, 2011 9:47 PM

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Dear Joy Sir,

Thanks a lot for your reply, i also wanted to know that how do temporary tables hold the result set of a stored procedure. i have read about temporary tables uses and found that they are used to hold the result set of a stored procedure.
Please can you explain this with an example?

Post #1063264

GilaMonster

Posted Sunday, February 13, 2011 10:34 PM

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They can be, but it's the same principal. Store the results in a temp table for further processing. Nothing much fancier than that.

CREATE TABLE #StoredProcOutput (
<definition>
);

INSERT INTO #StoredProcOutput
EXEC SomeStoredProcedure

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Post #1063280

Jeff Moden

Posted Sunday, February 13, 2011 11:07 PM

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SQLCHILD (2/13/2011)

Gail covered it above.

--Jeff Moden

Post #1063292

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