Sim Zacks <[EMAIL PROTECTED]> writes:
> Should there be any difference between:
> select * from table1 a left join table2 b on a.pk=b.fk and b.typeid=14
> and
> select * from table1 a left join table2 b on a.pk=b.fk
> where coalesce(b.typeid,14)=14
Quite a lot: every A row is guaranteed to appear in the output of the
first query, but not in the second. Consider for instance an A row that
only joins to b row(s) having typeid 13.
regards, tom lane
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TIP 6: explain analyze is your friend
