统计各个商品每月的销售金额
-- 主表ORDR 其中单号docentry, 客户cardcode,日期docdate
-- 销售订单子表RDR1 其中单号docentry, 行号linenum，物料itemcode，数量quantity, 单价price
select t.cardcode '客户编码',t1.itemcode '物料编码',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '1' then t1.quantity * t1.price end)),0) '一月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '2' then t1.quantity * t1.price end)),0) '二月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '3' then t1.quantity * t1.price end)),0) '三月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '4' then t1.quantity * t1.price end)),0) '四月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '5' then t1.quantity * t1.price end)),0) '五月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '6' then t1.quantity * t1.price end)),0) '六月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '7' then t1.quantity * t1.price end)),0) '七月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '8' then t1.quantity * t1.price end)),0) '八月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '9' then t1.quantity * t1.price end)),0) '九月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '10' then t1.quantity * t1.price end)),0) '十月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '11' then t1.quantity * t1.price end)),0) '十一月',
isnull(convert(dec(18,2),sum(case month(t.docdate) WHEN '12' then t1.quantity * t1.price end)),0) '十二月'
from RDR1 t1
left join ORDR t on t.docentry = t1.docentry
group by t.cardcode,t1.itemcode
可参考：
; with cte_tot as (
select PID, sum ( count ) totalmoney, convert ( varchar (10), month ( date ))+ '月' date
from 数据表 with (nolock) where date between '2013-01-01' and '2013-08-15' group by PID, month ( date ) )
select PID, sum (totalmoney) as totalmoney, sum ( case date when '1月' then totalmoney else null end ) as '1月' ,
sum ( case date when '2月' then totalmoney else null end ) as '2月' ,
sum ( case date when '3月' then totalmoney else null end ) as '3月' ,
sum ( case date when '4月' then totalmoney else null end ) as '4月' ,
sum ( case date when '5月' then totalmoney else null end ) as '5月' ,
sum ( case date when '6月' then totalmoney else null end ) as '6月' ,
sum ( case date when '7月' then totalmoney else null end ) as '7月' ,
sum ( case date when '8月' then totalmoney else null end ) as '8月' ,
sum ( case date when '9月' then totalmoney else null end ) as '9月' ,
sum ( case date when '10月' then totalmoney else null end ) as '10月' ,
sum ( case date when '11月' then totalmoney else null end ) as '11月' ,
sum ( case date when '12月' then totalmoney else null end ) as '12月'
from cte_tot group by PID
