SELECT isnull(a.cfdd,'') as 'sydw',b.mc as 'dwmc',count(*) as 'shl',sum(a.dj) as 'dj',sum(a.zzj) as 'zzj'
from a,b,c
where a.cfdd *=b.ddbh and a.sydw *=c.dwbh
group by a.cfdd,b.mc

谁帮我把这个SQL语句写成能在ACCESS数据库上查询的语句，谢谢了