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.
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|              FREDERIC MASSOT               |
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