codice:
select distinct
coalesce((select sum(importo)as Imp
from Clienti
where data between 20020101 and 20020131),0)as impGen
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20020201 and 20020229),0)as impFeb
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20020301 and 20030331),0)as impMar
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20020401 and 20020431),0)as impApr
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20020501 and 20020351),0)as impMag
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20020601 and 20020631),0)as impGiu
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20020701 and 20020731),0)as impLug
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20020801 and 20020831),0)as impAgo
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20020901 and 20020931),0)as impSet
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20021001 and 20021031),0)as impOtt
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20021101 and 20021131),0)as impNov
, coalesce((select sum(importo)as Imp
from Clienti
where data between 20021201 and 20021231),0)as impDic
from clienti
apri con questa query