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) awhere rowindex =@num
order by 序号,inputDate desc
end
getdata2005 4
select * from #temp
select ( select count(*) from #temp where company+ productif 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