select ID 编号,
    max(case [type] when '温度' then [value] else 0 end) 温度,
    max(case [type] when '湿度' then [value] else 0 end) 湿度,
    Point_ID 地点,
    [Time] 时间
from yourtable
group by ID,Point_ID,[Time]

------解决方案--------------------

看看是不是你想要的

SQL code

use tempdb 
go
--创建测试表
create table test
(
    ID            int, --编号ID
    [Type]        varchar(10),--类型
    Point_ID    int,--地点
    Value        int,--值
    [DateTime]  datetime--时间
);
--插入测试数据
insert into test values(1,'温度',1,30,'2012-5-1');
insert into test values(1,'湿度',1,50,'2012-5-1')
insert into test values(1,'温度',2,35,'2012-5-1')


select * from test

SELECT id ,MAX(CASE type WHEN '温度' THEN Value ELSE 0 END ) '温度',MAX(CASE type WHEN '湿度' THEN Value ELSE 0 END ) '湿度' ,Point_ID,[DateTime]
FROM test
GROUP BY id ,Point_ID,[DateTime]

------解决方案--------------------
SQL code

--行列互转
--摘自中国风博客，引用请标明内容来源
--1、行换列
if object_id('Class') is not  null
    drop table Class
Go
Create table Class(
[Student] nvarchar(2),
[Course] nvarchar(2),
[Score] int)
Insert Class
select N'张三',N'语文',78 union all
select N'张三',N'数学',87 union all
select N'张三',N'英语',82 union all
select N'张三',N'物理',90 union all
select N'李四',N'语文',65 union all
select N'李四',N'数学',77 union all
select N'李四',N'英语',65 union all
select N'李四',N'物理',85 
Go

--2000方法:
--动态:
declare @s nvarchar(4000)
set @s=''
Select @s=@s+','+quotename([Course])+'=max(case when [Course]='    
   
    +quotename([Course],'''')+' then [Score] else 0 end)'
from 
    Class group by[Course]
--select @s
exec('select [Student]'+@s+' from Class group by [Student]')
--生成静态:
select 
    [Student],
    [数学]=max(case when [Course]='数学' then [Score] else 0 end),
    [物理]=max(case when [Course]='物理' then [Score] else 0 end),
    [英语]=max(case when [Course]='英语' then [Score] else 0 end),
    [语文]=max(case when [Course]='语文' then [Score] else 0 end) 
from 
    Class 
group by [Student]
GO
--动态:

declare @s nvarchar(4000)
Select @s=isnull(@s+',','')+quotename([Course]) from Class group by[Course]
select @s
exec('select * from Class pivot (max([Score]) for [Course] in('+@s+'))b')

--生成静态:
select * 
from 
    Class 
pivot 
    (max([Score]) for [Course] in([数学],[物理],[英语],[语文]))b

--生成格式:
/*
Student 数学         物理         英语         语文
------- ----------- ----------- ----------- -----------
李四     77          85          65          65
张三     87          90          82          78

(2 行受影响)
*/

go
--加上总成绩(学科平均分)

--2000方法:
--动态:

declare @s nvarchar(4000)
set @s=''
Select @s=@s+','+quotename([Course])+'=max(case when [Course]='+quotename([Course],'''')+'then [Score] else 0 end)'
from Class group by[Course]
exec('select [Student]'+@s+',[总成绩]=sum([Score])  from Class group by [Student]')--加多一列(学科平均分用avg([Score]))

生成动态:

select 
    [Student],
    [数学]=max(case when [Course]='数学' then [Score] else 0 end),
    [物理]=max(case when [Course]='物理' then [Score] else 0 end),
    [英语]=max(case when [Course]='英语' then [Score] else 0 end),
    [语文]=max(case when [Course]='语文' then [Score] else 0 end),
    [总成绩]=([Score]) --加多一列(学科平均分用avg([Score]))
from 
    Class 
group by [Student]

go

--2005方法:

动态:

declare @s nvarchar(4000)
Select  @s=isnull(@s+',','')+quotename([Course]) from Class group by[Course] 
--isnull(@s+','