每個分類取最新的幾條的SQL實現代碼

2024-08-31 00:57:15

字體：大中小

來源：轉載

供稿：網友

CREATE TABLE table1( [ID] [bigint] IDENTITY(1,1) NOT NULL, [Name] [nvarchar](128) NOT NULL, [class] int not null, [date] datetime not null)class 表示分類編號。分類數不固定，至少有上千種分類
date 表示該條記錄被更新的時間
我們現在想獲得每個分類最新被更新的5條記錄。
解決方案
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','汽車1','2010-8-1')
insert into #temp(company,product,inputDate) values('杭州大明有限公司','汽車2','2010-8-1')
insert into #temp(company,product,inputDate) values('杭州大明有限公司','汽車3','2010-8-1')
insert into #temp(company,product,inputDate) values('杭州大明有限公司','汽車4','2010-8-1')
insert into #temp(company,product,inputDate) values('杭州大明有限公司','汽車5','2010-7-1')
insert into #temp(company,product,inputDate) values('北京小科有限公司','汽車1','2010-8-1')
insert into #temp(company,product,inputDate) values('北京小科有限公司','汽車2','2010-8-1')
insert into #temp(company,product,inputDate) values('北京小科有限公司','汽車3','2010-8-1')
insert into #temp(company,product,inputDate) values('北京小科有限公司','汽車4','2010-8-1')
insert into #temp(company,product,inputDate) values('上海有得有限公司','汽車1','2010-8-1')
insert into #temp(company,product,inputDate) values('上海有得有限公司','汽車2','2010-8-1')
insert into #temp(company,product,inputDate) values('上海有得有限公司','汽車3','2010-8-1')
insert into #temp(company,product,inputDate) values('上海有得有限公司','汽車4','2010-8-1')
insert into #temp(company,product,inputDate) values('天津旺旺有限公司','汽車4','2010-8-1')
insert into #temp(company,product,inputDate) values('天津旺旺有限公司','汽車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 序號,a.company,a.product,a.inputDate
from #temp a
) b
where 序號>=@num
order by 序號,inputDate desc
end
go
getdata 2
/*
結果
1 杭州大明有限公司汽車1 2010-08-01 00:00:00.000
1 北京小科有限公司汽車1 2010-08-01 00:00:00.000
1 上海有得有限公司汽車1 2010-08-01 00:00:00.000
1 天津旺旺有限公司汽車4 2010-08-01 00:00:00.000
2 天津旺旺有限公司汽車5 2010-08-01 00:00:00.000
2 上海有得有限公司汽車2 2010-08-01 00:00:00.000
2 北京小科有限公司汽車2 2010-08-01 00:00:00.000
2 杭州大明有限公司汽車2 2010-08-01 00:00:00.000
3 杭州大明有限公司汽車3 2010-08-01 00:00:00.000
3 北京小科有限公司汽車3 2010-08-01 00:00:00.000
3 上海有得有限公司汽車3 2010-08-01 00:00:00.000
4 北京小科有限公司汽車4 2010-08-01 00:00:00.000
4 北京小科有限公司汽車4 2010-08-01 00:00:00.000
4 上海有得有限公司汽車4 2010-08-01 00:00:00.000
4 杭州大明有限公司汽車4 2010-08-01 00:00:00.000
5 杭州大明有限公司汽車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 序號,a.company,a.product,a.inputDate
from #temp a
) b
where 序號>=@num
order by 序號,inputDate desc
end
getdata2005 4
select * from #temp
select ( select count(*) from #temp where company+ product<=a.company+a.product) as 序號,a.company,a.product,a.inputDate
,a.company+a.product as 唯一標志一行
from #temp a
order by company,product

復制代碼代碼如下:

Code highlighting produced by Actipro CodeHighlighter (freeware)>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 --第幾頁
as
begin
select companyname,product from
(
select row_number() over (partition by companyname order by id) as 序號,*
from #t
) a
where 序號=@num1
order by companyname
end
go
getdata 4
go
DROP procedure getdata