On Wed, 1 Oct 2003, CN wrote:
> Peter, Thanks a lot!
>
> > Unqualified count() cannot use an index because it has to visit all the
> > rows in the table.
>
> It is only for my test. In my real practice, queries like
> "SELECT * FROM view1 WHERE year = 2003 AND month BETWEEN 10 AND 12"
> will be performed.
You do realize that extract returns a double precision value not an
integer, and it's probably not going to be willing to push clauses down
through the union where the types are different .
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