Scope of Derived Tables in SQL Server

Posted by FailBoy on Stack Overflow See other posts from Stack Overflow or by FailBoy
Published on 2010-05-12T08:38:29Z Indexed on 2010/05/12 8:44 UTC
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sql

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scoping

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temptables

I've been looking into SQL recently and exploring a bit. in regards to Temp Tables I have discovered 3 different temp table types:

1) CREATE TABLE #TempTable

2) DECLARE TABLE @TempTable

3) SELECT * FROM (SELECT * FROM Customers) AS TempTable

Now I understand the scope behind the #TempTable and the @TempTable types, but what about the derived table as in example 3? Where does this derived table get stored? and if it is declared in 1 transaction, can a 2nd transaction access it, or is the scoping of Derived Tables that same as example 1 and 2?

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