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Execs and temporary tables


Execs and temporary tables

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honza.mf
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bitbucket-25253 (7/6/2012)
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


I must agree. It's the case of B#7.



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honza.mf
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WayneS (7/6/2012)
mtassin (7/6/2012)
Always nice to have an easy one on Friday....



I concur... but what is easy for one person isn't for another.

I'm surprised, there are someone (9% now) who choosed the "Every batch throws an error" answer. Curious.



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Koen Verbeeck
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Thanks for the question.


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baabhu
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Good Question !!!!!!.
SQLPhil
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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.


See I missed this on Friday so was still busy chewing some sour grapes! However, this week's starting out on a high note (despite the miserable British summer!) Cool
Danny Ocean
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unfortunately, i select the wrong one. Doze

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Vinay Kumar
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Good question, thanks.
Mike Palecek
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Very good question. I write code fairly often and it seems there is more to think about in SQL about scope than many programming languages. Either that or I just think about it more with programming.
honza.mf
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Mike Palecek (7/18/2012)
Very good question. I write code fairly often and it seems there is more to think about in SQL about scope than many programming languages. Either that or I just think about it more with programming.

Thank you. That's it.



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Tom Thomson
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Nice easy question.

But obviously batch 1 works, and batch 2 can't work (because the table is dropped by the exit from exec), and only one of the answers permits that; a different set of answer options could have made it necessary to look and see what the other batches did, which would perhaps have made it a better (although somewhat more tedious) question.

Tom

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