每个分类取最新的几条的SQL实现代码(汽车有限公司)

date 表示该条记录被更新的时间
我们现在想获得每个分类最新被更新的5条记录。
解决方案
select id,name,class,date from(select id,name,class,date ,row_number() over(partition by class order by date desc)as rowindex from table1) awhere rowindex <= 5
create table #temp
(
company varchar(50),
product varchar(50),
inputDate datetime
)
insert into #temp(company,product,inputDate) values('杭州大明有限公司','汽车1','2010-8-1')
insert into #temp(company,product,inputDate) values('杭州大明有限公司','汽车2','2010-8-1')
insert into #temp(company,product,inputDate) values('杭州大明有限公司','汽车3','2010-8-1')
insert into #temp(company,product,inputDate) values('杭州大明有限公司','汽车4','2010-8-1')
insert into #temp(company,product,inputDate) values('杭州大明有限公司','汽车5','2010-7-1')
insert into #temp(company,product,inputDate) values('北京小科有限公司','汽车1','2010-8-1')
insert into #temp(company,product,inputDate) values('北京小科有限公司','汽车2','2010-8-1')
insert into #temp(company,product,inputDate) values('北京小科有限公司','汽车3','2010-8-1')
insert into #temp(company,product,inputDate) values('北京小科有限公司','汽车4','2010-8-1')
insert into #temp(company,product,inputDate) values('上海有得有限公司','汽车1','2010-8-1')
insert into #temp(company,product,inputDate) values('上海有得有限公司','汽车2','2010-8-1')
insert into #temp(company,product,inputDate) values('上海有得有限公司','汽车3','2010-8-1')
insert into #temp(company,product,inputDate) values('上海有得有限公司','汽车4','2010-8-1')
insert into #temp(company,product,inputDate) values('天津旺旺有限公司','汽车4','2010-8-1')
insert into #temp(company,product,inputDate) values('天津旺旺有限公司','汽车5','2010-8-1')
select * from #temp
create proc getdata
@num int
as
begin
select top 4 * from
(
select ( select count(*) from #temp where company=a.company and product<=a.product) as 序号,a.company,a.product,a.inputDate
from #temp a
) b
where 序号>=@num
order by 序号,inputDate desc
end
go
getdata 2
/*
结果
1 杭州大明有限公司汽车1 2010-08-01 00:00:00.000
1 北京小科有限公司汽车1 2010-08-01 00:00:00.000
1 上海有得有限公司汽车1 2010-08-01 00:00:00.000
1 天津旺旺有限公司汽车4 2010-08-01 00:00:00.000
2 天津旺旺有限公司汽车5 2010-08-01 00:00:00.000
2 上海有得有限公司汽车2 2010-08-01 00:00:00.000
2 北京小科有限公司汽车2 2010-08-01 00:00:00.000
2 杭州大明有限公司汽车2 2010-08-01 00:00:00.000
3 杭州大明有限公司汽车3 2010-08-01 00:00:00.000
3 北京小科有限公司汽车3 2010-08-01 00:00:00.000
3 上海有得有限公司汽车3 2010-08-01 00:00:00.000
4 北京小科有限公司汽车4 2010-08-01 00:00:00.000
4 北京小科有限公司汽车4 2010-08-01 00:00:00.000
4 上海有得有限公司汽车4 2010-08-01 00:00:00.000
4 杭州大明有限公司汽车4 2010-08-01 00:00:00.000
5 杭州大明有限公司汽车5 2010-07-01 00:00:00.000
*/
--sql2005
create proc getdata2005
@num int
as
begin
select top 4 * from
(
select row_number() over (partition by company order by product ) as 序号,a.company,a.product,a.inputDate
from #temp a
) b
where 序号>=@num
order by 序号,inputDate desc
end
getdata2005 4
select * from #temp
select ( select count(*) from #temp where company+ product<=a.company+a.product) as 序号,a.company,a.product,a.inputDate
,a.company+a.product as 唯一标志一行
from #temp a
order by company,product

复制代码代码如下:

 
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->if object_id(N'company') is not null 

drop table company 

go 

create table company 

( 

companyname varchar(2), 

product varchar(60) 

) 

--公司1 

insert into company 

select 'A','A1' union 

select 'A','A2' union 

select 'A','A3' union 

select 'A','A4' union 

select 'A','A5' union 

select 'A','A6' union 

select 'A','A7' union 

select 'A','A8' union 

select 'A','A9' union 

select 'A','A10' 

--公司2 

insert into company 

select 'B','B1' union 

select 'B','B2' union 

select 'B','B3' union 

select 'B','B4' union 

select 'B','B5' union 

select 'B','B6' union 

select 'B','B7' union 

select 'B','B8' union 

select 'B','B9' union 

select 'B','B10' 

--公司3 

insert into company 

select 'C','C1' union 

select 'C','C2' union 

select 'C','C3' union 

select 'C','C4' union 

select 'C','C5' union 

select 'C','C6' union 

select 'C','C7' union 

select 'C','C8' union 

select 'C','C9' union 

select 'C','C10' 

--公司4 

insert into company 

select 'D','D1' union 

select 'D','D2' union 

select 'D','D3' union 

select 'D','D4' union 

select 'D','D5' union 

select 'D','D6' union 

select 'D','D7' union 

select 'D','D8' union 

select 'D','D9' union 

select 'D','D10' 

--公司5 

insert into company 

select 'E','E1' union 

select 'E','E2' union 

select 'E','E3' union 

select 'E','E4' union 

select 'E','E5' union 

select 'E','E6' union 

select 'E','E7' union 

select 'E','E8' union 

select 'E','E9' union 

select 'E','E10' 

--公司6 

insert into company 

select 'F','F1' union 

select 'F','F2' union 

select 'F','F3' union 

select 'F','F4' union 

select 'F','F5' union 

select 'F','F6' union 

select 'F','F7' union 

select 'F','F8' union 

select 'F','F9' union 

select 'F','F10' 

--公司7 

insert into company 

select 'G','G1' union 

select 'G','G2' union 

select 'G','G3' union 

select 'G','G4' union 

select 'G','G5' union 

select 'G','G6' union 

select 'G','G7' union 

select 'G','G8' union 

select 'G','G9' union 

select 'G','G10' 

--公司8 

insert into company 

select 'H','H1' union 

select 'H','H2' union 

select 'H','H3' union 

select 'H','H4' union 

select 'H','H5' union 

select 'H','H6' union 

select 'H','H7' union 

select 'H','H8' union 

select 'H','H9' union 

select 'H','H10' 

--公司9 

insert into company 

select 'I','I1' union 

select 'I','I2' union 

select 'I','I3' union 

select 'I','I4' union 

select 'I','I5' union 

select 'I','I6' union 

select 'I','I7' union 

select 'I','I8' union 

select 'I','I9' union 

select 'I','I10' 

--公司10 

insert into company 

select 'J','J1' union 

select 'J','J2' union 

select 'J','J3' union 

select 'J','J4' union 

select 'J','J5' union 

select 'J','J6' union 

select 'J','J7' union 

select 'J','J8' union 

select 'J','J9' union 

select 'J','J10' 

IF (select Object_id('Tempdb..#t')) IS NULL 

select identity(int,1,1) as id,* into #t from company 

order by left(product,1),cast(substring(product,2,2) as int) 

if object_id(N'getdata','P') is not null 

drop table getdata 

go 

create proc getdata 

@num1 int --第几页 

as 

begin 

select companyname,product from 

( 

select row_number() over (partition by companyname order by id) as 序号,* 

from #t 

) a 

where 序号=@num1 

order by companyname 

end 

go 

getdata 4 

go 

DROP procedure getdata