说明：
(1)日期以年月形式显示：convert(varchar(7),字段名,120) ,
(2)加一列
(3)自编号：
row_number() over(order by 字段名 desc) as RowID
row_number() over(partition by 字段1 order by 字段2) as RowID
(4)自编号的限制(不可直接在WHERE条件中加)
举例说明：
想要达到的效果：按月统计各工种的前5名(以件数为依据)
初始SQL语句：
select sum(Sum_TrueNum) 件数,PickUser_Name 拣货人,convert(varchar(7),PickTime,120) 时间
from V_OutIn_MainTop
where Brand_ID=66 and ClassReport_Name=‘出库‘ and len(PickUser_Name)>0
and PickTime>=‘2014-9-1‘ and PickTime<‘2014-12-1‘
group by PickUser_Name,convert(varchar(7),PickTime,120)
效果图：
第一步： 加一列
SQL语句：
select 工种=‘拣货‘,sum(Sum_TrueNum) 件数,PickUser_Name 拣货人,convert(varchar(7),PickTime,120) 时间
from V_OutIn_MainTop
where Brand_ID=66 and ClassReport_Name=‘出库‘ and len(PickUser_Name)>0
and PickTime>=‘2014-9-1‘ and PickTime<‘2014-12-1‘
group by PickUser_Name,convert(varchar(7),PickTime,120)
效果图：
第二步：加自编号(按月、按人分组排序)
SQL语句：
select 工种=‘拣货‘,row_number() over(partition by convert(varchar(7),PickTime,120) order by sum(Sum_TrueNum) desc)as RowID,
sum(Sum_TrueNum) 件数,PickUser_Name 拣货人,convert(varchar(7),PickTime,120) 时间
from V_OutIn_MainTop
where Brand_ID=66 and ClassReport_Name=‘出库‘ and len(PickUser_Name)>0
and PickTime>=‘2014-9-1‘ and PickTime<‘2014-12-1‘
group by PickUser_Name,convert(varchar(7),PickTime,120)
效果图：
第三步：自编号限定(只取前几名)
SQL语句：
with rowJianHuo
as
(
select 工种=‘拣货‘,row_number() over(partition by convert(varchar(7),PickTime,120) order by sum(Sum_TrueNum) desc)as RowID,
sum(Sum_TrueNum) 件数,PickUser_Name 拣货人,convert(varchar(7),PickTime,120) 时间
from V_OutIn_MainTop
where Brand_ID=66 and ClassReport_Name=‘出库‘ and len(PickUser_Name)>0
and PickTime>=‘2014-9-1‘ and PickTime<‘2014-12-1‘
group by PickUser_Name,convert(varchar(7),PickTime,120)
)
select * from rowJianHuo
where RowID<6
也可以这样写：
select * from
(
select 工种=‘拣货‘,row_number() over(partition by convert(varchar(7),PickTime,120) order by sum(Sum_TrueNum) desc)as RowID,
sum(Sum_TrueNum) 件数,PickUser_Name 拣货人,convert(varchar(7),PickTime,120) 时间
from V_OutIn_MainTop
where Brand_ID=66 and ClassReport_Name=‘出库‘ and len(PickUser_Name)>0
and PickTime>=‘2014-9-1‘ and PickTime<‘2014-12-1‘
group by PickUser_Name,convert(varchar(7),PickTime,120)
)a
where RowID<6
效果图：(数据有点少，所以数据没有变化)
备注：
两个表，结构相同，连成一张表：用
select * from 表1
union all
select * from 表2