表如下:
DataTime DataName DataValue
2009-9-1 20:50:10 Name1 20
2009-9-1 20:50:15 Name1 30
2009-9-1 20:50:16 Name2 25
2009-9-1 20:51:00 Name2 50
2009-9-1 20:51:12 Name1 5
2009-9-1 20:51:25 Name2 10
2009-9-1 20:52:30 Name2 40
2009-9-1 20:52:40 Name3 12
2009-9-1 20:53:10 Name3 60
2009-9-1 20:54:00 Name2 70
现在想得到如下结果:
DataTime DataName DataValue
2009-9-1 20:50:10 Name1 20
2009-9-1 20:50:16 Name2 25
2009-9-1 20:51:12 Name1 5
2009-9-1 20:51:25 Name2 10
2009-9-1 20:52:40 Name3 12
2009-9-1 20:54:00 Name2 70
简单的说,就是按时间顺序将重复的、相邻的DataName值去掉,使得相邻的是不同的DataName。
紧急呼叫高手来Help!!!!!!!!!!!!!!!!!
DataTime DataName DataValue
2009-9-1 20:50:10 Name1 20
2009-9-1 20:50:15 Name1 30
2009-9-1 20:50:16 Name2 25
2009-9-1 20:51:00 Name2 50
2009-9-1 20:51:12 Name1 5
2009-9-1 20:51:25 Name2 10
2009-9-1 20:52:30 Name2 40
2009-9-1 20:52:40 Name3 12
2009-9-1 20:53:10 Name3 60
2009-9-1 20:54:00 Name2 70
现在想得到如下结果:
DataTime DataName DataValue
2009-9-1 20:50:10 Name1 20
2009-9-1 20:50:16 Name2 25
2009-9-1 20:51:12 Name1 5
2009-9-1 20:51:25 Name2 10
2009-9-1 20:52:40 Name3 12
2009-9-1 20:54:00 Name2 70
简单的说,就是按时间顺序将重复的、相邻的DataName值去掉,使得相邻的是不同的DataName。
紧急呼叫高手来Help!!!!!!!!!!!!!!!!!
/******************************************************************************************************************************************************
1、Num、Name相同的重复值记录,没有大小关系只保留一条
2、Name相同,ID有大小关系时,保留大或小其中一个记录
整理人:中国风(Roy)日期:2008.06.06
******************************************************************************************************************************************************/--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)
*/本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/htl258/archive/2009/04/16/4083040.aspx小菜先上一碟
-- -----------t_mac 小编-------------------
--------------------希望有天成为大虾----
-- =========================================IF OBJECT_ID('tb') IS NOT NULL
DROP TABLE tb
GO
CREATE TABLE tb( DataTime datetime , DataName varchar(10),DataValue int)
go
insert tb SELECT
'2009-9-1 20:50:10' , 'Name1' , 20 UNION ALL SELECT
'2009-9-1 20:50:15' , 'Name1' , 30 UNION ALL SELECT
'2009-9-1 20:50:16' , 'Name2' , 25 UNION ALL SELECT
'2009-9-1 20:51:00' , 'Name2' , 50 UNION ALL SELECT
'2009-9-1 20:51:12' , 'Name1' , 5 UNION ALL SELECT
'2009-9-1 20:51:25' , 'Name2' , 10 UNION ALL SELECT
'2009-9-1 20:52:30' , 'Name2' , 40 UNION ALL SELECT
'2009-9-1 20:52:40' , 'Name3' , 12 UNION ALL SELECT
'2009-9-1 20:53:10' , 'Name3' , 60 UNION ALL SELECT
'2009-9-1 20:54:00' , 'Name2' , 70
go
select identity(int,1,1) as id ,* into # from tb
select DataTime , DataName ,DataValue
from # k
where not exists(select * from # where DataName=k.DataName and DataValue<k.DataValue and ABS(ID-k.id)=1)
go
DataTime DataName DataValue
----------------------- ---------- -----------
2009-09-01 20:50:10.000 Name1 20
2009-09-01 20:50:16.000 Name2 25
2009-09-01 20:51:12.000 Name1 5
2009-09-01 20:51:25.000 Name2 10
2009-09-01 20:52:40.000 Name3 12
2009-09-01 20:54:00.000 Name2 70
feixianxxx你太牛了!我还没有看懂题目,你就OK了
-- -----------t_mac 小编-------------------
--------------------希望有天成为大虾----
-- =========================================IF OBJECT_ID('tb') IS NOT NULL
DROP TABLE tb
GO
CREATE TABLE tb( DataTime datetime , DataName varchar(10),DataValue int)
go
insert tb SELECT
'2009-9-1 20:50:10' , 'Name1' , 20 UNION ALL SELECT
'2009-9-1 20:50:15' , 'Name1' , 30 UNION ALL SELECT
'2009-9-1 20:50:16' , 'Name2' , 25 UNION ALL SELECT
'2009-9-1 20:51:00' , 'Name2' , 50 UNION ALL SELECT
'2009-9-1 20:51:12' , 'Name1' , 5 UNION ALL SELECT
'2009-9-1 20:51:25' , 'Name2' , 10 UNION ALL SELECT
'2009-9-1 20:52:30' , 'Name2' , 40 UNION ALL SELECT
'2009-9-1 20:52:40' , 'Name3' , 12 UNION ALL SELECT
'2009-9-1 20:53:10' , 'Name3' , 60 UNION ALL SELECT
'2009-9-1 20:54:00' , 'Name2' , 70
go
with k1 as (
select ROW_NUMBER() over(order by getdate())as id ,* from tb
)
select DataTime , DataName ,DataValue
from k1 k
where not exists(select * from k1 where DataName=k.DataName and DataValue<k.DataValue and ABS(ID-k.id)=1)
go
/*
DataTime DataName DataValue
----------------------- ---------- -----------
2009-09-01 20:50:10.000 Name1 20
2009-09-01 20:50:16.000 Name2 25
2009-09-01 20:51:12.000 Name1 5
2009-09-01 20:51:25.000 Name2 10
2009-09-01 20:52:40.000 Name3 12
2009-09-01 20:54:00.000 Name2 70
*/
2005
-- -----------t_mac 小编-------------------
--------------------希望有天成为大虾----
-- =========================================IF OBJECT_ID('tb') IS NOT NULL
DROP TABLE tb
GO
CREATE TABLE tb( DataTime datetime , DataName varchar(10),DataValue int)
go
insert tb SELECT
'2009-9-1 20:50:10' , 'Name1' , 20 UNION ALL SELECT
'2009-9-1 20:50:15' , 'Name1' , 30 UNION ALL SELECT
'2009-9-1 20:50:16' , 'Name2' , 25 UNION ALL SELECT
'2009-9-1 20:51:00' , 'Name2' , 50 UNION ALL SELECT
'2009-9-1 20:51:12' , 'Name1' , 5 UNION ALL SELECT
'2009-9-1 20:51:25' , 'Name2' , 10 UNION ALL SELECT
'2009-9-1 20:52:30' , 'Name2' , 40 UNION ALL SELECT
'2009-9-1 20:52:40' , 'Name3' , 12 UNION ALL SELECT
'2009-9-1 20:53:10' , 'Name3' , 60 UNION ALL SELECT
'2009-9-1 20:54:00' , 'Name2' , 70
go
select identity(int,1,1) as id ,* into # from tb
select DataTime , DataName ,DataValue
from # k
where not exists(select * from # where DataName=k.DataName and DataTime <k.DataTime and ABS(ID-k.id)=1)
go
DataTime DataName DataValue
----------------------- ---------- -----------
2009-09-01 20:50:10.000 Name1 20
2009-09-01 20:50:16.000 Name2 25
2009-09-01 20:51:12.000 Name1 5
2009-09-01 20:51:25.000 Name2 10
2009-09-01 20:52:40.000 Name3 12
2009-09-01 20:54:00.000 Name2 70
if object_id('MAINDA') is not null drop table MAINDA
go
create table MAINDA(DataTime datetime, DataName varchar(10), DataValue int)
insert MAINDA select
'2009-9-1 20:50:10', 'Name1' , 20 union all select
'2009-9-1 20:50:15', 'Name1' , 30 union all select
'2009-9-1 20:50:16', 'Name2' , 25 union all select
'2009-9-1 20:51:00', 'Name2' , 50 union all select
'2009-9-1 20:51:12', 'Name1' , 5 union all select
'2009-9-1 20:51:25', 'Name2' , 10 union all select
'2009-9-1 20:52:30', 'Name2' , 40 union all select
'2009-9-1 20:52:40', 'Name3' , 12 union all select
'2009-9-1 20:53:10', 'Name3' , 60 union all select
'2009-9-1 20:54:00', 'Name2', 70 select *,id=identity(int,1,1) into #t from MAINDA order by datatimedelete from #t
where exists(select * from #t t where t.id=#t.id-1 and t.dataname=#t.dataname)select * from #tDataTime DataName DataValue id
----------------------- ---------- ----------- -----------
2009-09-01 20:50:10.000 Name1 20 1
2009-09-01 20:50:16.000 Name2 25 3
2009-09-01 20:51:12.000 Name1 5 5
2009-09-01 20:51:25.000 Name2 10 6
2009-09-01 20:52:40.000 Name3 12 8
2009-09-01 20:54:00.000 Name2 70 10(6 行受影响)
可是ASP.NET都不会。。
愁
--> 测试数据:[TB]
if object_id('[TB]') is not null drop table [TB]
create table [TB]([DataTime] datetime,[DataName] varchar(5),[DataValue] int)
insert [TB]
select '2009-9-1 20:50:10','Name1',20 union all
select '2009-9-1 20:50:15','Name1',30 union all
select '2009-9-1 20:50:16','Name2',25 union all
select '2009-9-1 20:51:00','Name2',50 union all
select '2009-9-1 20:51:12','Name1',5 union all
select '2009-9-1 20:51:25','Name2',10 union all
select '2009-9-1 20:52:30','Name2',40 union all
select '2009-9-1 20:52:40','Name3',12 union all
select '2009-9-1 20:53:10','Name3',60 union all
select '2009-9-1 20:54:00','Name2',70select id=identity(int,1,1),* into ## from TBselect * from ## where id not in(
select id from ## t where [DataName]=(select DataName from ## where id=t.id-1))/*
id DataTime DataName DataValue
----------- ----------------------- -------- -----------
1 2009-09-01 20:50:10.000 Name1 20
3 2009-09-01 20:50:16.000 Name2 25
5 2009-09-01 20:51:12.000 Name1 5
6 2009-09-01 20:51:25.000 Name2 10
8 2009-09-01 20:52:40.000 Name3 12
10 2009-09-01 20:54:00.000 Name2 70(6 行受影响)*/
drop table TB,##
/*---------------------------------
-- Author : htl258(Tony)
-- Date : 2009-09-01 21:15:35
-- Version: Microsoft SQL Server 2005 - 9.00.3077.00 (Intel X86)
Dec 17 2008 15:19:45
Copyright (c) 1988-2005 Microsoft Corporation
Developer Edition on Windows NT 6.0 (Build 6001: Service Pack 1)---------------------------------*/
--> 生成测试数据表:tbIf not object_id('[tb]') is null
Drop table [tb]
Go
Create table [tb]([DataTime] datetime,[DataName] nvarchar(5),[DataValue] int)
Insert [tb]
Select N'2009-9-1 20:50:10',N'Name1',20 union all
Select N'2009-9-1 20:50:15',N'Name1',30 union all
Select N'2009-9-1 20:50:16',N'Name2',25 union all
Select N'2009-9-1 20:51:00',N'Name2',50 union all
Select N'2009-9-1 20:51:12',N'Name1',5 union all
Select N'2009-9-1 20:51:25',N'Name2',10 union all
Select N'2009-9-1 20:52:30',N'Name2',40 union all
Select N'2009-9-1 20:52:40',N'Name3',12 union all
Select N'2009-9-1 20:53:10',N'Name3',60 union all
Select N'2009-9-1 20:54:00',N'Name2',70
Go
--Select * from [tb]-->SQL查询如下:
;with t as
(
select rn=row_number()over(order by getdate()),*
from tb
)
delete t
where exists(
select 1 from t a
where a.DataName=t.DataName
and t.rn-a.rn=1)select * from tb
/*
DataTime DataName DataValue
----------------------- -------- -----------
2009-09-01 20:50:10.000 Name1 20
2009-09-01 20:50:16.000 Name2 25
2009-09-01 20:51:12.000 Name1 5
2009-09-01 20:51:25.000 Name2 10
2009-09-01 20:52:40.000 Name3 12
2009-09-01 20:54:00.000 Name2 70(6 行受影响)
*/
SQL2005用新方法
3 楼是按 DATETIME 7楼按DataValue
-- Author :fredrickhu(小F,向高手学习)
-- Date :2009-09-01 21:23:02
-- Verstion:
-- Microsoft SQL Server 2005 - 9.00.4035.00 (Intel X86)
-- Nov 24 2008 13:01:59
-- Copyright (c) 1988-2005 Microsoft Corporation
-- Developer Edition on Windows NT 5.1 (Build 2600: Service Pack 3)
--
----------------------------------------------------------------
--> 测试数据:[tb]
if object_id('[tb]') is not null drop table [tb]
go
create table [tb]([DataTime] datetime,[DataName] varchar(5),[DataValue] int)
insert [tb]
select '2009-9-1 20:50:10','Name1',20 union all
select '2009-9-1 20:50:15','Name1',30 union all
select '2009-9-1 20:50:16','Name2',25 union all
select '2009-9-1 20:51:00','Name2',50 union all
select '2009-9-1 20:51:12','Name1',5 union all
select '2009-9-1 20:51:25','Name2',10 union all
select '2009-9-1 20:52:30','Name2',40 union all
select '2009-9-1 20:52:40','Name3',12 union all
select '2009-9-1 20:53:10','Name3',60 union all
select '2009-9-1 20:54:00','Name2',70
--------------开始查询--------------------------
select id=identity(int,1,1) ,* into # from tb
select
DataTime , DataName ,DataValue
from
# t
where
not exists(select * from # where DataName=t.DataName and DataTime <t.DataTime and abs(ID-t.id)=1)
drop table #
----------------结果----------------------------
/* DataTime DataName DataValue
----------------------- -------- -----------
2009-09-01 20:50:10.000 Name1 20
2009-09-01 20:50:16.000 Name2 25
2009-09-01 20:51:12.000 Name1 5
2009-09-01 20:51:25.000 Name2 10
2009-09-01 20:52:40.000 Name3 12
2009-09-01 20:54:00.000 Name2 70(6 行受影响)
*/