Re: subquery vs. join?
From my experience, whenever you can use a join instead of a subquery (or a where clause), use a join!! And make sure that the biggest tables are used last, whenever possible. I have experienced this on a database with more than 260,000 records (average size), and my queries ended up saving near 5 seconds over queries that could take up about 5 to 6 seconds (which is a HUGE performance gain)!!
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