andrew wrote: > Sorry for the confusion. This is what i meant. Thanks, Michael. > > select * > from (select * from A, B where A.a = B.b) as s > where foo(s) < 2; > > On 1/25/06, Peter Eisentraut <[EMAIL PROTECTED]> wrote: > > andrew wrote: > > > I want to use a UDF to filter tuples t that are generated after a > > > join. More specifially, I have a UDF foo(record), which computes > > > a value for a given tuple. I can do the filtering before the > > > join. e.g.: > > > > > > select * from A, B where foo(A)<2 and A.a=B.b;
Note that these two queries will produce the same internal execution plan, so if you wanted to make some difference you will not. -- Peter Eisentraut http://developer.postgresql.org/~petere/ ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
