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From: Cedric Dufour (Cogito Ergo Soft) <cedric.dufour@cogito-ergo-soft.com>
To: frederic massot <frederic@juliana-multimedia.com>
To: pgsql-sql@postgresql.org
Subject: Re: SQL syntax
Date: Tue, 6 Aug 2002 19:10:11 +0200
Message-ID: <NDBBIFNBODNADCAOFDOAMEKLCDAA.cedric.dufour@cogito-ergo-soft.com> (raw)
In-Reply-To: <3D4FEB4C.3D4D06ED@juliana-multimedia.com>

I would try something like

SELECT
	(id_mois+12)%12
FROM
	( SELECT id_mois-12 AS id_mois FROM mois
	UNION
	SELECT id_mois FROM mois
	UNION
	SELECT id_mois+12 AS id_mois FROM mois ) AS mois_etendu
WHERE
	( mois_etendu.id_mois >= (mon_mois-2) )
	AND
	( mois_etendu.id_mois <= (mon_mois+9) )

where 'mon_mois' is your reference month (e.g. 8)

	Cedric Dufour

> -----Original Message-----
> From: pgsql-sql-owner@postgresql.org
> [mailto:pgsql-sql-owner@postgresql.org]On Behalf Of frederic massot
> Sent: Tuesday, August 06, 2002 17:29
> To: pgsql-sql@postgresql.org
> Subject: [SQL] SQL syntax
> 
> 
> Hello,
> 
> I have a table containing the months of the year :
> 
> 
> travail=> select * from mois order by id_mois;
> 
> id_mois|mois_fr  |mois_en  |mois_de
> -------+---------+---------+---------
>       1|Janvier  |January  |Januar
>       2|Fevrier  |February |Februar
>       3|Mars     |March    |Marz
>       4|Avril    |April    |April
>       5|Mai      |May      |Aber
>       6|Juin     |June     |Juni
>       7|Juillet  |July     |Juli
>       8|Aout     |August   |August
>       9|Septembre|September|September
>      10|Octobre  |October  |Oktober
>      11|Novembre |November |November
>      12|Decembre |December |Dezember
> (12 rows)
> 
> 
> And I try to obtain for one month given (for example August : 8) two
> previous months, the current month, and nine next months :
> 
> 
> id_mois|mois_fr  |mois_en  |mois_de
> -------+---------+---------+---------
>       6|Juin     |June     |Juni
>       7|Juillet  |July     |Juli
>       8|Aout     |August   |August
>       9|Septembre|September|September
>      10|Octobre  |October  |Oktober
>      11|Novembre |November |November
>      12|Decembre |December |Dezember
>       1|Janvier  |January  |Januar
>       2|Fevrier  |February |Februar
>       3|Mars     |March    |Marz
>       4|Avril    |April    |April
>       5|Mai      |May      |Aber
> 
> 
> Do you see how making in a SQL request ? 
> 
> Thank you.
> -- 
> ==============================================
> |              FREDERIC MASSOT               |
> |     http://www.juliana-multimedia.com      |
> |   mailto:frederic@juliana-multimedia.com   |
> ===========================Debian=GNU/Linux===
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
> 




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  Subject: Re: SQL syntax
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