| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | Joost Kraaijeveld <J(dot)Kraaijeveld(at)askesis(dot)nl> |
| Cc: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: What should this query match? |
| Date: | 2005-09-14 10:48:24 |
| Message-ID: | 200509141248.24909.peter_e@gmx.net |
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| Lists: | pgsql-sql |
Am Mittwoch, 14. September 2005 11:54 schrieb Joost Kraaijeveld:
> Why do the following queries return the same count (may be related to
> the first question)
>
> SELECT COUNT(*) FROM customers
> WHERE lower(lastName) < lower('Jan%')
>
> SELECT COUNT(*) FROM customers
> WHERE lower(lastName) <= lower('Jan%')
These queries should return the same answer if the query does not contain the
value 'Jan%' (or differently capitalized versions). I suspect that you are
actually attempting to use % as a wild card, but none of your queries use a
pattern matching operator, so I'd go back and check if your queries really
are what you think they should be.
--
Peter Eisentraut
http://developer.postgresql.org/~petere/
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