每个分类取最新的几条的SQL实现代码
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每个分类取最新的几条的SQL实现代码，需要的朋友可以参考下
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 <= 5
create table #temp
(
pany varchar(50),
product varchar(50),
inputDate datetime
)
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车1','2010-8-1')
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车2','2010-8-1')
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车3','2010-8-1')
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车4','2010-8-1')
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车5','2010-7-1')
insert into #temp(pany,product,inputDate) values('北京小科有限公司','汽车1','2010-8-1')
insert into #temp(pany,product,inputDate) values('北京小科有限公司','汽车2','2010-8-1')
insert into #temp(pany,product,inputDate) values('北京小科有限公司','汽车3','2010-8-1')
insert into #temp(pany,product,inputDate) values('北京小科有限公司','汽车4','2010-8-1')
insert into #temp(pany,product,inputDate) values('上海有得有限公司','汽车1','2010-8-1')
insert into #temp(pany,product,inputDate) values('上海有得有限公司','汽车2','2010-8-1')
insert into #temp(pany,product,inputDate) values('上海有得有限公司','汽车3','2010-8-1')
insert into #temp(pany,product,inputDate) values('上海有得有限公司','汽车4','2010-8-1')
insert into #temp(pany,product,inputDate) values('天津旺旺有限公司','汽车4','2010-8-1')
insert into #temp(pany,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 4 * from
(
select ( select count(*) from #temp where pany=a.pany and product<=a.product) as 序号,a.pany,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 4 * from
(
select row_number() over (partition by pany order by product ) as 序号,a.pany,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 pany+ product<=a.pany+a.product) as 序号,a.pany,a.product,a.inputDate
,a.pany+a.product as 唯一标志一行
from #temp a
order by pany,product
Code highlighting produced by Actipro CodeHighlighter (freeware)http://.CodeHighlighter./-->if object_id(N'pany') is not null
drop table pany
go
create table pany
(
panyname varchar(2),
product varchar(60)
)
--公司1
insert into pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 panyname,product from
(
select row_number() over (partition by panyname order by id) as 序号,*
from #t
) a
where 序号=@num1
order by panyname
end
go
getdata 4
go
DROP procedure getdata
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
(
pany varchar(50),
product varchar(50),
inputDate datetime
)
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车1','2010-8-1')
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车2','2010-8-1')
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车3','2010-8-1')
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车4','2010-8-1')
insert into #temp(pany,product,inputDate) values('杭州大明有限公司','汽车5','2010-7-1')
insert into #temp(pany,product,inputDate) values('北京小科有限公司','汽车1','2010-8-1')
insert into #temp(pany,product,inputDate) values('北京小科有限公司','汽车2','2010-8-1')
insert into #temp(pany,product,inputDate) values('北京小科有限公司','汽车3','2010-8-1')
insert into #temp(pany,product,inputDate) values('北京小科有限公司','汽车4','2010-8-1')
insert into #temp(pany,product,inputDate) values('上海有得有限公司','汽车1','2010-8-1')
insert into #temp(pany,product,inputDate) values('上海有得有限公司','汽车2','2010-8-1')
insert into #temp(pany,product,inputDate) values('上海有得有限公司','汽车3','2010-8-1')
insert into #temp(pany,product,inputDate) values('上海有得有限公司','汽车4','2010-8-1')
insert into #temp(pany,product,inputDate) values('天津旺旺有限公司','汽车4','2010-8-1')
insert into #temp(pany,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 4 * from
(
select ( select count(*) from #temp where pany=a.pany and product<=a.product) as 序号,a.pany,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 4 * from
(
select row_number() over (partition by pany order by product ) as 序号,a.pany,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 pany+ product<=a.pany+a.product) as 序号,a.pany,a.product,a.inputDate
,a.pany+a.product as 唯一标志一行
from #temp a
order by pany,product
代码如下:
Code highlighting produced by Actipro CodeHighlighter (freeware)http://.CodeHighlighter./-->if object_id(N'pany') is not null
drop table pany
go
create table pany
(
panyname varchar(2),
product varchar(60)
)
--公司1
insert into pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 pany
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 panyname,product from
(
select row_number() over (partition by panyname order by id) as 序号,*
from #t
) a
where 序号=@num1
order by panyname
end
go
getdata 4
go
DROP procedure getdata
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