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Re: UTF-8 and LIKE vs =

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: David Wheeler <david(at)kineticode(dot)com>
Cc: Ian Barwick <barwick(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: UTF-8 and LIKE vs =
Date: 2004-08-23 22:44:47
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Lists: pgsql-general
David Wheeler <david(at)kineticode(dot)com> writes:
> On Aug 23, 2004, at 1:58 PM, Ian Barwick wrote:
>> er, the characters in "name" don't seem to match the characters in the
>> query - '=B1=B9=B9=E6=BA=F1' vs. '=BA=CF=C7=D1=C0=C7' - does that have an=
> y bearing?

> Yes, it means that = is doing the wrong thing!!

I have seen this happen in situations where the strings contained
character sequences that were illegal according to the encoding that the
locale thought was in force.  (It seems that strcoll() will return more
or less random results in such cases...)  In particular, given that you

> LC_COLLATE:                           en_US.UTF-8
> LC_CTYPE:                             en_US.UTF-8

you are at risk if the data is not legal UTF-8 strings.

The real question therefore is whether you have the database encoding
set correctly --- ie, is it UNICODE (== UTF8)?  If not then it may well
be that Postgres is presenting strings to strcoll() that the latter will
choke on.

			regards, tom lane

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