摘自于网络网络：http://blog.csdn.net/wanmdb/article/details/8080636

create table T(日期时间 datetime, 数量 int) insert T select '2007-1-1 19:31:25 ', 56 union all select '2007-1-1 21:31:25 ', 35 union all select '2007-1-1 15:31:25 ', 43 union all select '2007-1-2 19:31:25 ', 34 union all select '2007-1-3 15:31:25 ', 35 union all select '2007-1-3 21:31:25 ', 65 --按日统计 select 日期时间=convert(char(10), 日期时间, 120), 数量=sum(数量) from T group by convert(char(10), 日期时间, 120) --按周统计 select 日期时间=datepart(week, 日期时间), 数量=sum(数量) from T where year(日期时间)=year(getdate()) group by datepart(week, 日期时间) --按月统计 select 日期时间=convert(char(7), 日期时间, 120), 数量=sum(数量) from T group by convert(char(7), 日期时间, 120) 　　实例：　　按日统计　　select sum(cniTicketCount) as STickCount,Convert(varchar(10),cnAppDate,23) as ScnAppDate from (select B.*,U.UserName from SystemUsers U inner join BookingDetails B on U.AutoID=B.cnvcApplyManwhere B.cniTicketCount>0 and B.cnAppDate between '2010/09/01' and '2010/10/01') as Agroup by Convert(varchar(10),cnAppDate,23)　　按周统计　　select sum(cniTicketCount) as STickCount,datepart(week,cnAppDate)as ScnAppDate from (select B.*,U.UserName from SystemUsers U inner join BookingDetails B on U.AutoID=B.cnvcApplyManWhere B.cniTicketCount>0) as Agroup by datepart(week,cnAppDate)　　按月统计　　select sum(cniTicketCount) as STickCount,substring(Convert(varchar(10),cnAppDate,23),1,7) as ScnAppDate from (select B.*,U.UserName from SystemUsers U inner join BookingDetails B on U.AutoID=B.cnvcApplyManWhere B.cniTicketCount>0) as Agroup by substring(Convert(varchar(10),cnAppDate,23),1,7)