Re: > and >= give the same result

On Thu, 29 Dec 2011 10:16:53 -0500
Frank Bax <fbax@sympatico.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@sympatico.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)

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