From: | "Jean-Yves F(dot) Barbier" <12ukwn(at)gmail(dot)com> |
---|---|
To: | pgsql-novice(at)postgresql(dot)org |
Subject: | Re: > and >= give the same result |
Date: | 2011-12-29 15:30:44 |
Message-ID: | 20111229163044.217a4e41@anubis.defcon1 |
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Lists: | pgsql-novice |
On Thu, 29 Dec 2011 10:16:53 -0500
Frank Bax <fbax(at)sympatico(dot)ca> wrote:
> On 12/29/11 09:29, Jean-Yves F. Barbier wrote:
> > On Thu, 29 Dec 2011 08:48:37 -0500
> > Frank Bax<fbax(at)sympatico(dot)ca> wrote:
> >>
> >> The string 'y%' is greater than 'y'! Therefore, both queries will return
> >> y% and z% - where is the problem?
> >
> > Well, I hoped '>' would have returned all rows beginning by 'z'
> > and not any 'y'.
>
>
> WHERE substr(note,0,1)>'y'
Nope:
comgest=> SELECT * FROM tst1m WHERE substr(note,0,1) > 'y' ORDER BY name;
id | name | note
----+------+------
(0 ligne)
comgest=> SELECT * FROM tst1m WHERE substr(note,0,1) > 'y%' ORDER BY name;
id | name | note
----+------+------
(0 ligne)
comgest=> SELECT * FROM tst1m WHERE note ILIKE 'z%' ORDER BY name;
...
(2567 lignes)
--
PUNK ROCK!! DISCO DUCK!! BIRTH CONTROL!!
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