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Execs and temporary tables


Execs and temporary tables

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honza.mf
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Comments posted to this topic are about the item Execs and temporary tables



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Steve Hall
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That explanation requires expanding slightly, because there is more than one type of temporary table.
Local temporary tables (prefixes with '#') go out of scope when the exec command completes. However, use '##' to create a Global temporary table and the table can be accessed outside of the exec statement that created it.

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Good back-to-basics question, thanks Honza.

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My gut instinct on this was right. Unfortunately I did not listen to this and chose incorrectly. Doh!!Hehe
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Good question, thanks.
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BrainDonor (7/6/2012)
That explanation requires expanding slightly, because there is more than one type of temporary table.
Local temporary tables (prefixes with '#') go out of scope when the exec command completes. However, use '##' to create a Global temporary table and the table can be accessed outside of the exec statement that created it.


Thanks for the amplification.

And thanks to OP for the interesting question.

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Great question and a nice way to end the week. :-)



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This question made up for yesterday's beating. Glad we ending the week with this one.
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David Harder (7/6/2012)
This question made up for yesterday's beating. Glad we ending the week with this one.

Yes, I agree.
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Emphasis (bolding) added by this poster

BrainDonor (7/6/2012)
That explanation requires expanding slightly, because there is more than one type of temporary table.
Local temporary tables (prefixes with '#') go out of scope when the exec command completes. However, use '##' to create a Global temporary table and the table can be accessed outside of the exec statement that created it.


At the completion of the command given in the QOD

exec ('create table #qotd2 (id int))'

follows the above since the exec command completes, that is #qotd2 has gone out of scope.

To illustrate, the code below has been modified so that the entire sequence of commands is contained within the scope of the exec command.

exec ('create table #qotd2 (id int)
alter table #qotd2 add i int
insert into #qotd2 (i) values (2)
select * from #qotd2
drop table #qotd2')



The above then will return for the SELECT statement the values:
id         i
NULL 2



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

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