Dynamic SQL with Temp Tables

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Dynamic SQL with Temp Tables

ntran777

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January 25, 2011 at 3:13 pm

#230811

Hello all,
I'm having a bit of a problem here. I need a proc that can make a variable number of temporary tables on the fly. It would have to take an input that tells it how many to make and then create them using a naming convention such as #temp1, #temp2, #temp3, etc.
Obviously my problem is that I would have to use dynamic SQL in which case the temp tables would go out of scope after the execute statement.
I would use global tables but I need to be able to access this proc concurrently from other sessions.
Any ideas on my options here?
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mister.magoo SSC-Forever Points: 47068 More actions · Answer 1

How about using a new database and creating uniquely named tables - perhaps include the SPID in the name

MM

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Ron McCullough SSC Guru Points: 63877 More actions · Answer 2

Have you considered doing something like this:

SELECT EntryId, Entry, Description

INTO #T

FROM logentries

The INTO statement will create the temporary table.

If everything seems to be going well, you have obviously overlooked something.

Ron

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ntran777 SSC Eights! Points: 981 More actions · Answer 3

Ron, I don't think this would work for my situation b/c the table would still be created in the scope of the exec statement if I were to use dynamic sql to generate names.

I need something that would let me either create the tables in the same scope as my stored procedure or some other way to create table names on the fly.

WayneS SSC Guru Points: 95409 More actions · Answer 4

mister.magoo (1/25/2011)
How about using a new database and creating uniquely named tables - perhaps include the SPID in the name

This sounds like an excellent idea. I'm not sure that a new database would be necessary.

Edit: A permanent table would allow the procedure to create the table dynamically, then use it.

Wayne
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ntran777 SSC Eights! Points: 981 More actions · Answer 5

Okay, it seems a permanent table could be used with session IDs appended.

What are the I/O implications with this though? This will be put on a server with some heavy traffic from multiple clients. I'm afraid that the performance may take a big hit using permanent tables.

Ken McKelvey SSCoach Points: 18768 More actions · Answer 6

ntran777 (1/25/2011)
I need a proc that can make a variable number of temporary tables on the fly.

I would be interested in knowing why you need to do this. It may be that there are better ways around the problem.

eg If the tables have the same structure you could create one temporary table with the addition of a SetNumber column.

ntran777 SSC Eights! Points: 981 More actions · Answer 7

I'm creating a table for reporting that has too many columns in it to return as one. The rows go over SQL's 8060b limit. To solve this, I'm gathering the data into smaller tables and joining them together for the application to use. I don't know how many tables will need to be created. It depends on how many columns the particular customer has defined.

lnoland SSCommitted Points: 1753 More actions · Answer 8

ntran777 (1/26/2011)
I'm creating a table for reporting that has too many columns in it to return as one. The rows go over SQL's 8060b limit. To solve this, I'm gathering the data into smaller tables and joining them together for the application to use. I don't know how many tables will need to be created. It depends on how many columns the particular customer has defined.

How about using dynamic SQL to create the stored procedure which creates and uses the temp tables?

- Les