"Karen Hill" <[EMAIL PROTECTED]> writes:
> It seems PostgreSQL doesn't have a TOP Predicate.  Why is that?

It's not in the SQL standard.  If we were to implement something like
what I think you're asking for (your example is way underspecified),
it'd probably look like SQL2003's window functions.

                        regards, tom lane

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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