每个分类取最新的几条的SQL实现

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每个分类取最新的几条的SQL实现
```
CREATE TABLE table1
(
    [ID] [bigint] IDENTITY(1,1) NOT NULL,
    [Name] [nvarchar](128) NOT NULL,
    [class] int not null,
    [date] datetime not null
)
```
class 表示分类编号。分类数不固定，至少有上千种分类
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) a
where 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

代码

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
查看全文

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原文地址：https://www.cnblogs.com/zengxiangzhan/p/1639886.html