主表
rq f1 subID
2012-1-1 6 1
2012-1-1 7 2
2012-1-2 3 1
.........
id关系表
maiID subID
1 1
1 2
.............
要求统计按mainID每天统计f1的和，该如何做？
------解决方案--------------------
- SQL code
select a.rq,b.maiID,sum(a.f1) as f1from 主表 as ainner join 关系表 as b on a.subID=b.subIDgroup by a.rq,b.maiID
------解决方案--------------------
select sum(f1), rq from a join b on a.subID = b.subID group by rq