It's possible that this is more a php question than a mysql question,
but since the two are so nearly joined at the hip, I'm hoping someone
can advise anyhow.
I'm developing a php job that uses a table 'sessions' to maintain a
logical session across pages and physical sessions. It's a simple
tabl
Is there a generally-accepted rule of thumb for estimating the
performance cost of joins? I can't find one even in Date, but
intuitively it seems as though there must be one by now.
I'm thinking of something like 'if not doing anything costs 0, and
reading 1 table costs 100, then joining a secon
