各位高手请教,用SQL语句进行分组统计的问题

木奇 2012-08-04 01:05:48
向各位高手请教下,如何才能用SQL语句实现统计工序的最后一条及并显示出来,谢谢啦!


表InfoTable

序号 工序 信息 时间
1 1 1.2 2012-8-1
2 1 1.4 2012-8-2
3 1 1.8 2012-8-3
4 1 1.6 2012-8-4
5 2 1.2 2012-8-5
6 2 1.4 2012-8-6
7 2 2.1 2012-8-7
8 3 2.3 2012-8-8
9 3 2.8 2012-8-9
10 3 1.2 2012-8-10
11 3 1.4 2012-8-11
12 3 2.1 2012-8-12
13 3 2.3 2012-8-13


查询结果为:
序号 工序 信息 时间
4 1 1.6 2012-8-4
7 2 2.1 2012-8-7
13 3 2.3 2012-8-13


谢谢啦!
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木奇 2012-08-04
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一个问题有那么多方法可以实现,学习啦!
木奇 2012-08-04
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感谢各位高手,搞定了,谢谢啦!


select 序号,样本编号,工序,信息, 时间 from InfoTable
where 序号 in (select max(t.序号) as 序号 from InfoTable t group by t.工序,t.样本编号)


谢谢各位啦!

木奇 2012-08-04
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[Quote=引用 8 楼 的回复:]
SQL code
GO

SELECT * FROM (
SELECT RIndex=ROW_NUMBER() OVER(PARTITION BY 样本编号,工序 ORDER BY 时间 desc),* FROM T
) t WHERE RIndex=1 order by 序号

[/Quote]

还有别的方法吗?谢谢啦
七色鸟 2012-08-04
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IF OBJECT_ID('T') IS NOT NULL DROP TABLE T
GO
CREATE TABLE T(
序号 INT ,
样本编号 INT,
工序 INT ,
信息 DECIMAL(18,2),
时间 DATETIME
)
GO

INSERT INTO T
SELECT 1,1,1,1.2,'2012-8-1' UNION ALL
SELECT 2,2,1,1.4,'2012-8-2' UNION ALL
SELECT 3,3,1,1.8,'2012-8-3' UNION ALL
SELECT 4,1,1,1.6,'2012-8-4' UNION ALL
SELECT 5,2,1,1.2,'2012-8-5' UNION ALL
SELECT 6,3,1,1.4,'2012-8-6' UNION ALL
SELECT 7,1,2,2.1,'2012-8-7' UNION ALL
SELECT 8,2,2,2.3,'2012-8-8' UNION ALL
SELECT 9,3,2,2.8,'2012-8-9' UNION ALL
SELECT 10,1,2,1.2,'2012-8-10' UNION ALL
SELECT 11,2,2,1.4,'2012-8-11' UNION ALL
SELECT 12,3,2,2.1,'2012-8-12' UNION ALL
SELECT 13,1,2,2.3,'2012-8-13' UNION ALL
SELECT 14,2,2,1.6,'2012-8-14' UNION ALL
SELECT 15,3,2,1.2,'2012-8-15' UNION ALL
SELECT 16,1,3,1.4,'2012-8-16' UNION ALL
SELECT 17,2,3,2.1,'2012-8-17' UNION ALL
SELECT 18,3,3,2.3,'2012-8-18' UNION ALL
SELECT 19,1,3,2.8,'2012-8-19' UNION ALL
SELECT 20,2,3,1.2,'2012-8-20' UNION ALL
SELECT 21,3,3,1.6,'2012-8-21' UNION ALL
SELECT 22,1,3,1.2,'2012-8-22' UNION ALL
SELECT 23,2,3,1.4,'2012-8-23' UNION ALL
SELECT 24,3,3,2.1,'2012-8-24'

GO

SELECT * FROM (
SELECT RIndex=ROW_NUMBER() OVER(PARTITION BY 样本编号,工序 ORDER BY 时间 desc),* FROM T
) t WHERE RIndex=1 order by 序号
木奇 2012-08-04
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不好意思,不是问上面的问题,想请教如何查询每个样本的最后一条记录及并显示出来,谢谢

表InfoTable

序号 样本编号 工序 信息 时间
1 1 1 1.2 2012-8-1
2 2 1 1.4 2012-8-2
3 3 1 1.8 2012-8-3
4 1 1 1.6 2012-8-4
5 2 1 1.2 2012-8-5
6 3 1 1.4 2012-8-6
7 1 2 2.1 2012-8-7
8 2 2 2.3 2012-8-8
9 3 2 2.8 2012-8-9
10 1 2 1.2 2012-8-10
11 2 2 1.4 2012-8-11
12 3 2 2.1 2012-8-12
13 1 2 2.3 2012-8-13
14 2 2 1.6 2012-8-14
15 3 2 1.2 2012-8-15
16 1 3 1.4 2012-8-16
17 2 3 2.1 2012-8-17
18 3 3 2.3 2012-8-18
19 1 3 2.8 2012-8-19
20 2 3 1.2 2012-8-20
21 3 3 1.6 2012-8-21
22 1 3 1.2 2012-8-22
23 2 3 1.4 2012-8-23
24 3 3 2.1 2012-8-24

序号 样本编号 工序 信息 时间
4 1 1 1.6 2012-8-4
5 2 1 1.2 2012-8-5
6 3 1 1.4 2012-8-6
13 1 2 2.3 2012-8-13
14 2 2 1.6 2012-8-14
15 3 2 1.2 2012-8-15
22 1 3 1.2 2012-8-22
23 2 3 1.4 2012-8-23
24 3 3 2.1 2012-8-24

谢谢各位啦!
木奇 2012-08-04
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各位高手再请教下,如果要查询某个样本的每个工序的最后一条记录及并显示出来,如何写SQL语句呀?


表InfoTable

序号 样本编号 工序 信息 时间
1 1 1 1.2 2012-8-1
2 2 1 1.4 2012-8-2
3 3 1 1.8 2012-8-3
4 1 1 1.6 2012-8-4
5 2 1 1.2 2012-8-5
6 3 1 1.4 2012-8-6
7 1 2 2.1 2012-8-7
8 2 2 2.3 2012-8-8
9 3 2 2.8 2012-8-9
10 1 2 1.2 2012-8-10
11 2 2 1.4 2012-8-11
12 3 2 2.1 2012-8-12
13 1 2 2.3 2012-8-13
14 2 2 1.6 2012-8-14
15 3 2 1.2 2012-8-15
16 1 3 1.4 2012-8-16
17 2 3 2.1 2012-8-17
18 3 3 2.3 2012-8-18
19 1 3 2.8 2012-8-19
20 2 3 1.2 2012-8-20
21 3 3 1.6 2012-8-21
22 1 3 1.2 2012-8-22
23 2 3 1.4 2012-8-23
24 3 3 2.1 2012-8-24


查询样本编号为2的每个工序的最后一个记录,结果为:
序号 样本编号 工序 信息 时间
5 2 1 1.2 2012-8-5
14 2 2 1.6 2012-8-14
23 2 3 1.4 2012-8-23


谢谢啦!
以学习为目的 2012-08-04
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;with cte as
(select *,RankID=RANK()over()(partition by 工序 order by 序号 desc)
from InfoTable)

select * from cte where cte.RankID=1

筱筱澄 2012-08-04
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--1、用于查询重复处理记录(如果列没有大小关系时2000用生成自增列和临时表处理,SQL2005用row_number函数处理)

--> --> (Roy)生成測試數據

if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([ID] int,[Name] nvarchar(1),[Memo] nvarchar(2))
Insert #T
select 1,N'A',N'A1' union all
select 2,N'A',N'A2' union all
select 3,N'A',N'A3' union all
select 4,N'B',N'B1' union all
select 5,N'B',N'B2'
Go


--I、Name相同ID最小的记录(推荐用1,2,3),方法3在SQl05时,效率高于1、2
方法1:
Select * from #T a where not exists(select 1 from #T where Name=a.Name and ID<a.ID)

方法2:
select a.* from #T a join (select min(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID

方法3:
select * from #T a where ID=(select min(ID) from #T where Name=a.Name)

方法4:
select a.* from #T a join #T b on a.Name=b.Name and a.ID>=b.ID group by a.ID,a.Name,a.Memo having count(1)=1

方法5:
select * from #T a group by ID,Name,Memo having ID=(select min(ID)from #T where Name=a.Name)

方法6:
select * from #T a where (select count(1) from #T where Name=a.Name and ID<a.ID)=0

方法7:
select * from #T a where ID=(select top 1 ID from #T where Name=a.name order by ID)

方法8:
select * from #T a where ID!>all(select ID from #T where Name=a.Name)

方法9(注:ID为唯一时可用):
select * from #T a where ID in(select min(ID) from #T group by Name)

--SQL2005:

方法10:
select ID,Name,Memo from (select *,min(ID)over(partition by Name) as MinID from #T a)T where ID=MinID

方法11:

select ID,Name,Memo from (select *,row_number()over(partition by Name order by ID) as MinID from #T a)T where MinID=1

生成结果:
/*
ID Name Memo
----------- ---- ----
1 A A1
4 B B1

(2 行受影响)
*/


--II、Name相同ID最大的记录,与min相反:
方法1:
Select * from #T a where not exists(select 1 from #T where Name=a.Name and ID>a.ID)

方法2:
select a.* from #T a join (select max(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID order by ID

方法3:
select * from #T a where ID=(select max(ID) from #T where Name=a.Name) order by ID

方法4:
select a.* from #T a join #T b on a.Name=b.Name and a.ID<=b.ID group by a.ID,a.Name,a.Memo having count(1)=1

方法5:
select * from #T a group by ID,Name,Memo having ID=(select max(ID)from #T where Name=a.Name)

方法6:
select * from #T a where (select count(1) from #T where Name=a.Name and ID>a.ID)=0

方法7:
select * from #T a where ID=(select top 1 ID from #T where Name=a.name order by ID desc)

方法8:
select * from #T a where ID!<all(select ID from #T where Name=a.Name)

方法9(注:ID为唯一时可用):
select * from #T a where ID in(select max(ID) from #T group by Name)

--SQL2005:

方法10:
select ID,Name,Memo from (select *,max(ID)over(partition by Name) as MinID from #T a)T where ID=MinID

方法11:
select ID,Name,Memo from (select *,row_number()over(partition by Name order by ID desc) as MinID from #T a)T where MinID=1

生成结果2:
/*
ID Name Memo
----------- ---- ----
3 A A3
5 B B2

(2 行受影响)
*/



--2、删除重复记录有大小关系时,保留大或小其中一个记录


--> --> (Roy)生成測試數據

if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([ID] int,[Name] nvarchar(1),[Memo] nvarchar(2))
Insert #T
select 1,N'A',N'A1' union all
select 2,N'A',N'A2' union all
select 3,N'A',N'A3' union all
select 4,N'B',N'B1' union all
select 5,N'B',N'B2'
Go

--I、Name相同ID最小的记录(推荐用1,2,3),保留最小一条
方法1:
delete a from #T a where exists(select 1 from #T where Name=a.Name and ID<a.ID)

方法2:
delete a from #T a left join (select min(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID where b.Id is null

方法3:
delete a from #T a where ID not in (select min(ID) from #T where Name=a.Name)

方法4(注:ID为唯一时可用):
delete a from #T a where ID not in(select min(ID)from #T group by Name)

方法5:
delete a from #T a where (select count(1) from #T where Name=a.Name and ID<a.ID)>0

方法6:
delete a from #T a where ID<>(select top 1 ID from #T where Name=a.name order by ID)

方法7:
delete a from #T a where ID>any(select ID from #T where Name=a.Name)



select * from #T

生成结果:
/*
ID Name Memo
----------- ---- ----
1 A A1
4 B B1

(2 行受影响)
*/


--II、Name相同ID保留最大的一条记录:

方法1:
delete a from #T a where exists(select 1 from #T where Name=a.Name and ID>a.ID)

方法2:
delete a from #T a left join (select max(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID where b.Id is null

方法3:
delete a from #T a where ID not in (select max(ID) from #T where Name=a.Name)

方法4(注:ID为唯一时可用):
delete a from #T a where ID not in(select max(ID)from #T group by Name)

方法5:
delete a from #T a where (select count(1) from #T where Name=a.Name and ID>a.ID)>0

方法6:
delete a from #T a where ID<>(select top 1 ID from #T where Name=a.name order by ID desc)

方法7:
delete a from #T a where ID<any(select ID from #T where Name=a.Name)


select * from #T
/*
ID Name Memo
----------- ---- ----
3 A A3
5 B B2

(2 行受影响)
*/





--3、删除重复记录没有大小关系时,处理重复值


--> --> (Roy)生成測試數據

if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([Num] int,[Name] nvarchar(1))
Insert #T
select 1,N'A' union all
select 1,N'A' union all
select 1,N'A' union all
select 2,N'B' union all
select 2,N'B'
Go

方法1:
if object_id('Tempdb..#') is not null
drop table #
Select distinct * into # from #T--排除重复记录结果集生成临时表#

truncate table #T--清空表

insert #T select * from # --把临时表#插入到表#T中

--查看结果
select * from #T

/*
Num Name
----------- ----
1 A
2 B

(2 行受影响)
*/

--重新执行测试数据后用方法2
方法2:

alter table #T add ID int identity--新增标识列
go
delete a from #T a where exists(select 1 from #T where Num=a.Num and Name=a.Name and ID>a.ID)--只保留一条记录
go
alter table #T drop column ID--删除标识列

--查看结果
select * from #T

/*
Num Name
----------- ----
1 A
2 B

(2 行受影响)

*/

--重新执行测试数据后用方法3
方法3:
declare Roy_Cursor cursor local for
select count(1)-1,Num,Name from #T group by Num,Name having count(1)>1
declare @con int,@Num int,@Name nvarchar(1)
open Roy_Cursor
fetch next from Roy_Cursor into @con,@Num,@Name
while @@Fetch_status=0
begin
set rowcount @con;
delete #T where Num=@Num and Name=@Name
set rowcount 0;
fetch next from Roy_Cursor into @con,@Num,@Name
end
close Roy_Cursor
deallocate Roy_Cursor

--查看结果
select * from #T
/*
Num Name
----------- ----
1 A
2 B

(2 行受影响)
*/
筱筱澄 2012-08-04
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select * from [InfoTable] as a where
not exists(select 1 from [InfoTable] where [工序]=a.[工序] and [序号]>a.[序号])

/*
序号 工序 信息 时间
----------- ----------- ---------- -----------------------
4 1 1.6 2012-08-04 00:00:00.000
7 2 2.1 2012-08-07 00:00:00.000
13 3 2.3 2012-08-13 00:00:00.000

(3 行受影响)

*/
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if object_id('[InfoTable]') is not null drop table [InfoTable]
create table [InfoTable]([序号] int,[工序] int,[信息] varchar(10),[时间] datetime)
go
insert into [InfoTable]
select 1, 1, '1.2', '2012-8-1' union all
select 2, 1, '1.4', '2012-8-2' union all
select 3, 1, '1.8', '2012-8-3' union all
select 4, 1, '1.6', '2012-8-4' union all
select 5, 2, '1.2', '2012-8-5' union all
select 6, 2, '1.4', '2012-8-6' union all
select 7, 2, '2.1', '2012-8-7' union all
select 8, 3, '2.3', '2012-8-8' union all
select 9, 3, '2.8', '2012-8-9' union all
select 10, 3, '1.2', '2012-8-10' union all
select 11, 3, '1.4', '2012-8-11' union all
select 12, 3, '2.1', '2012-8-12' union all
select 13, 3, '2.3', '2012-8-13'

select [序号],[工序],[信息], [时间] from [InfoTable]
where [序号] in (select max(t.[序号]) '序号' from [InfoTable] t group by t.[工序])

/*
(13 行受影响)
序号 工序 信息 时间
----------- ----------- ---------- -----------------------
4 1 1.6 2012-08-04 00:00:00.000
7 2 2.1 2012-08-07 00:00:00.000
13 3 2.3 2012-08-13 00:00:00.000

(3 行受影响)
*/
人生无悔 2012-08-04
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select 序号,工序,信息,时间 from InfoTable t where 时间=(select max(时间) from InfoTable t1 where t.工序=t1.工序)

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