hello *,
i am constructing a rather longish join where i want to select distinct
rows only. however, i know that the join-rows i collect are distinct
within the first two columns (it's a primary key of one of the join
partners). many more columns are selected.
question: can the optimizer tell how much of the query result to test
for distinctness ? can i help by providing the information to the
optimizer ?
thanks for any advice,
Raimund
--
Raimund Jacob
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