sheet的   表字段：sheet_id,made_date
 produce_bear 表 的字段：sheet_id,bear_q
sheet_id 的字段是‘年’-’月‘-‘日’
想按照月份小计，最后一年合计
我写得sql是：select case when grouping(left(right(p.sheet_id,7),2))=1 then '合计' else left(right(p.sheet_id,7),2) end 月份,case when grouping (p.sheet_id)=1 and grouping (left(right(p.sheet_id,7),2))=0 then '小计' else p.sheet_id end 单号,max(p.meterial_id),max(t.made_date) ,sum(bear_q) as 啤数 from produce_bear p inner join sheet t on t.sheet_id=p.sheet_id where p.meterial_id='02100330000109' group by left(right(p.sheet_id,7),2),p.sheet_id with rollup 
结果显示为：
月份   sheet_id              meterial_id                made_date                                 bear_q
2         2011-02-0001    021001                   2011-02-05                               100
2         2011-02-0002    021001                   2011-02-06                               100
2         2011-02-0003    021001                   2011-02-07                                100
2         小计                   021001                   2011-02-07                             300
3        2011-03-0001    021001                   2011-03-05                               23     3        2011-03-0002    021001                   2011-03-07                                100
3         小计                   021001                   2011-03-07                               123
合计    null                      021001                   2011-03-07                             423

想在小计和合计那里就显示，meterial_id    和bear_q,不显示sheet_id，made_date