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col_1 IN (select id from something) AND
col_2 IN (select id from something_else)
INNER JOIN (select col_1 from something) A USING (col_1)
INNER JOIN (select col_2 from something_else) B USING (col_2)
Once (shame on you!)
Twice (shame on me!)
More often than I'd like to be
All the time
Just when answering stupid polls
Who you callin' a fool?
I refuse to vote in this ridiculous poll
Results (531 votes). Check out past polls.