我有一个表， 要全部生成结果， 如果能用一个SQL语句搞定最好，
其中：
从vip第一次消费记录的每个月都要生成， 比如A 2013年1月份开始消费， 2月份没消费， 2月份也要出来，
B从2月份开始消费， 那记录就从2月份开始
这是原始表语句：
create table #xs(vip varchar(20), date datetime, sale float)
insert into #xs(vip, date, sale)
select 'A' as vip,'2013-1-1' as date, 230 as sale union all
select 'A','2013-1-5', 400 union all
select 'A','2013-3-6', 500 union all
select 'A','2013-4-30',600 union all
select 'B','2013-2-3',200 union all
select 'B','2013-3-5',300 union all
select 'B','2013-4-24',400
select * from #xs
------解决方案--------------------
要是动态的，一条语句有点儿费劲！
1、要拼接出每个会员从开始消费月份到结束消费月的的所有月份。
2、然后左连接计算出每月消费次数
3、递归计算累计数
------解决方案--------------------
多久每消费可以这个[code=sql]select datediff (DAY ,date,DATEADD(MONTH, 1, date - DAY(date) + 1) - 1) as 多久没消费 from #xs[code]
------解决方案--------------------
if object_id('tempdb..#xs') is not null
drop table #xs;
create table #xs(vip varchar(20), date datetime, sale float)
insert into #xs(vip, date, sale)
select 'A' as vip,'2013-1-1' as date, 230 as sale union all
select 'A','2013-1-5', 400 union all
select 'A','2013-3-6', 500 union all
select 'A','2013-4-30',600 union all
select 'B','2013-2-3',200 union all
select 'B','2013-3-5',300 union all
select 'B','2013-4-24',400
;with t as
(
select dateadd(month, number,'20130101') MonthDay
from master.dbo.spt_values
where type='p'
)
,tRange as
(
select vip,convert(varchar(6),min(date),112)+'01' MinMonth,convert(varchar(6),max(date),112)+'01' MaxMonth
from #xs
group by vip
),tDimDate as
(
select tr.vip,t.MonthDay StartDay,dateadd(d,-1,DATEADD(month,1,t.MonthDay)) EndDay
from tRange tr
join t
on tr.MinMonth<=t.MonthDay
and tr.MaxMonth>=t.MonthDay
),tdata as (
select t.vip,EndDay
,DATEDIFF(d,(select top 1 date from #xs xs where xs.date <=t.EndDay and xs.vip=t.vip order by xs.date desc ),EndDay) NoVisitDays
,count(x.date) VisitDays
,sum(isnull(sale,0)) Sales
from tDimDate t
left join #xs x
on x.[date] between t.StartDay and t.EndDay
and t.vip=x.vip
group by t.vip,EndDay
)
select vip,EndDay,NoVisitDays,VisitDays
,sum(VisitDays) over(partition by vip order by EndDay ) sumVisitDays
,sum(Sales) over(partition by vip order by EndDay ) sumSales
from tdata
------解决方案--------------------
create table #xs(vip varchar(20), date datetime, sale float)
insert into #xs(vip, date, sale)
select 'A' as vip,'2013-1-1' as date, 230 as sale union all
select 'A','2013-1-5', 400 union all
select 'A','2013-3-6', 500 union all
select 'A','2013-4-30',600 union all
select 'B','2013-2-3',200 union all
select 'B','2013-3-5',300 union all
select 'B','2013-4-24',400
--select * from #xs
;WITH cte AS (
SELECT vip,[date],DATEADD(dd,-1,DATEADD(mm,DATEDIFF(m,0,[date]),0)) bomonth,DATEADD(dd,-1,DATEADD(mm,DATEDIFF(m,0,[date])+1,0)) AS eomonth,sale
FROM #xs
),c2 AS (
SELECT vip,eomonth,COUNT(1) AS monthCount,SUM(sale) AS sale FROM cte GROUP BY vip,[bomonth],eomonth
),c3 AS(
SELECT a.number,b.vip FROM master..spt_values a JOIN (SELECT DISTINCT vip FROM #xs) b ON 1=1 WHERE a.type='p' AND a.number BETWEEN 1 AND 12