sql server 2005 中的分区函数用法(partition by 字段)

以下例子根据Item 分组后.排序.

应用例子如下:


if exists(select 1 from sys.objects where object_id=object_id('tab'))


begin


drop table tab


end


go


create table tab(item int, date datetime, temp int)


insert tab select 10,'2006-01-01',0


union all select 10,'2006-02-01',0


union all select 10,'2006-03-01',0


union all select 20,'2006-01-01',0


union all select 20,'2006-02-01',0


union all select 30,'2006-01-01',0


union all select 30,'2006-02-01',0


union all select 30,'2006-03-01',0


union all select 30,'2006-04-01',0


union all select 30,'2006-05-01',0


go


select *,row_number() over(partition by item order by date ) as t from tab


go






--结果




/**//*


item date temp t


----------- ----------------------- ----------- --------------------


10 2006-01-01 00:00:00.000 0 1


10 2006-02-01 00:00:00.000 0 2


10 2006-03-01 00:00:00.000 0 3


20 2006-01-01 00:00:00.000 0 1


20 2006-02-01 00:00:00.000 0 2


30 2006-01-01 00:00:00.000 0 1


30 2006-02-01 00:00:00.000 0 2


30 2006-03-01 00:00:00.000 0 3


30 2006-04-01 00:00:00.000 0 4


30 2006-05-01 00:00:00.000 0 5




(10 行受影响)




*/