Bill Talada (9/10/2012)
Setting STATISTICS TIME & IO ON will cause severe slowdowns. I generally write each table as a separate SELECT in the FROM clause as above because it always self documents and simultaneously optimizes. Often the sub-selects can be reused in other procs. I'm maintaining 1000+ custom procs in a world class application. Everything is fast although the databases are all under 100 GB.Give it another try!
While I agree setting STATISTICS TIME & IO on will cause slowdowns I would think they would slow both queries down equally wouldn't they? I'll try running it on one of our bigger test servers and see what happens.
Kenneth FisherI was once offered a wizards hat but it got in the way of my dunce cap.--------------------------------------------------------------------------------For better, quicker answers on T-SQL questions, click on the following... http://www.sqlservercentral.com/articles/Best+Practices/61537/[/url]For better answers on performance questions, click on the following... http://www.sqlservercentral.com/articles/SQLServerCentral/66909/[/url]Link to my Blog Post --> www.SQLStudies.com[/url]