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CREATE TABLE #tmpTable(Col1 int, Col2 int)
Table variable
DECLARE @tmpTable TABLE(Col1 int, Col2 int)
I did some searching, and one of the first results was this site. Interesting read, even though it was only the first part of a subscription only article. It turns out that table data types are slower than temporary tables for large sets of data, because SQL Server doesn't maintain statistics for queries on table variables.
Visit for more details http://developmentzone.blogspot.com/2008/08/sql-server-temporary-tables.html
Visit also http://developmentzone.blogspot.com/2008/08/temporary-tables-performance.html