Une façon de faire est de créer et de remplir un tableau rempli de mois consécutifs.
Vous pouvez alors OUTER JOIN en utilisant cette table.
Donc quelque chose comme :
drop table if exists all_months;
create table all_months (a_month_id int unsigned PRIMARY KEY,a_month varchar(20) NOT NULL, UNIQUE KEY `all_months_uidx1` (a_month));
insert into all_months values (1,'January');
insert into all_months values (2,'February');
insert into all_months values (3,'March');
insert into all_months values (4,'April');
insert into all_months values (5,'May');
insert into all_months values (6,'June');
insert into all_months values (7,'July');
insert into all_months values (8,'August');
insert into all_months values (9,'September');
insert into all_months values (10,'October');
insert into all_months values (11,'November');
insert into all_months values (12,'December');
SELECT SUM(IFNULL(t1.VerkoopfactBedrag,0)) AS bedrag,
am.a_month AS date
from
(
select
ifnull(vn.VerkoopfactBedrag,0) as VerkoopfactBedrag,
cast(DATE_FORMAT(VerkoopfactDatum, '%M') as char) as mdate
FROM verkoopfacturen vn
WHERE Verkoopfact_UserId = 12
AND VerkoopfactDatum BETWEEN '2011-01-01' AND '2011-12-31'
GROUP BY DATE_FORMAT(VerkoopfactDatum, '%M')
) t1 RIGHT OUTER JOIN all_months am on t1.mdate = am.a_month
group by am.a_month
order by a_month_id asc;
PS Je ne sais pas si vous avez quelque chose contre Oudejaarsavond mais il y a 31 jours en décembre;-)
