Try creating an index on the substrings: you will need
to wrap the substring in a function marked "immutable"
(or "with (iscachable)" for versions prior to 7.3) for
the index to be of any use.
I have done a lot of the sort of thing you describe,
with good results using that method.
--- Francisco Reyes <lists@natserv.com> wrote:
> On Tue, 4 Feb 2003, Bruno Wolff III wrote:
>
> > On Mon, Feb 03, 2003 at 16:32:10 -0500,
> > Francisco Reyes <lists@natserv.com> wrote:
> > > Any hints suggestions on dealing with complex
> queries.
> >
> > > substring(ppl.carried_as from 1 for 3)
> > > = substring(jc.last from 1 for
> 3) and
> >
> > Joining on substrings is a good sign that your
> design needs rethinking.
>
> The tables in the substring comparison are some of
> our tables compared
> to tables supplied by another company. It is a fact
> that the names don't
> always match and have variations.
>
> The whole excersise is to match by names to then
> populate our table with
> their keys so in the future we can match by keys in
> feeds we receive from
> them.
>
>
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