表名:tb1
name1 name2 name3 name4 name5
a b c d e
aa bb cc dd ee 表如上
我要实现的是一行SQL语句实现如下内容
1 name1 a aa
2 name2 b bb
3 name3 c cc
4 name4 d dd
5 name5 e ee这里的表不是确定的,所以列名也不是确定的,这里查询结果的第2列是要查询出tb1表的列名(name1 name2 name3 name4 name5),后面的列要根据数据表的行数对应增加,也就是说查询结果的列数要根据数据表的行数而变化各位高手快来指点.80分敬上,不够再加!
name1 name2 name3 name4 name5
a b c d e
aa bb cc dd ee 表如上
我要实现的是一行SQL语句实现如下内容
1 name1 a aa
2 name2 b bb
3 name3 c cc
4 name4 d dd
5 name5 e ee这里的表不是确定的,所以列名也不是确定的,这里查询结果的第2列是要查询出tb1表的列名(name1 name2 name3 name4 name5),后面的列要根据数据表的行数对应增加,也就是说查询结果的列数要根据数据表的行数而变化各位高手快来指点.80分敬上,不够再加!
insert into tb1
select 'a','b','c','d','e'
union all
select 'aa','bb','cc','dd','ee'
union all
select 'aaa','bbb','ccc','ddd','eee'
----测试
declare @columns varchar(max),@i int,@istr varchar(max),@sqlstr varchar(max)
set @istr=''
set @i=1
while @i<=(select COUNT(1) from tb1)
begin
set @istr=@istr+','+quotename(@i)
set @i=@i+1
end
set @istr=STUFF(@istr,1,1,'')
set @columns=stuff((select ','+QUOTENAME(name) from sys.columns where object_id=object_id('tb1') for xml path('')),1,1,'')set @sqlstr='select * from (select * from (select *,ROW_NUMBER() over(order by getdate()) rowid from tb1) as a'+
' unpivot(TT for name in ('+@columns+')) b) as X'+
' pivot(max(TT) for rowid in ('+@istr+')) as Y'
exec(@sqlstr)
--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+',','') 去掉字符串@s中第一个逗号exec('select [Student],'+@s+',[总成绩] from (select *,[总成绩]=sum([Score])over(partition by [Student]) from Class) a
pivot (max([Score]) for [Course] in('+@s+'))b ')--生成静态:select
[Student],[数学],[物理],[英语],[语文],[总成绩]
from
(select *,[总成绩]=sum([Score])over(partition by [Student]) from Class) a --平均分时用avg([Score])
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 总成绩
------- ----------- ----------- ----------- ----------- -----------
李四 77 85 65 65 292
张三 87 90 82 78 337(2 行受影响)
*/go--2、列转行
if not object_id('Class') is null
drop table Class
Go
Create table Class([Student] nvarchar(2),[数学] int,[物理] int,[英语] int,[语文] int)
Insert Class
select N'李四',77,85,65,65 union all
select N'张三',87,90,82,78
Go--2000:动态:declare @s nvarchar(4000)
select @s=isnull(@s+' union all ','')+'select [Student],[Course]='+quotename(Name,'''')--isnull(@s+' union all ','') 去掉字符串@s中第一个union all
+',[Score]='+quotename(Name)+' from Class'
from syscolumns where ID=object_id('Class') and Name not in('Student')--排除不转换的列
order by Colid
exec('select * from ('+@s+')t order by [Student],[Course]')--增加一个排序生成静态:
select *
from (select [Student],[Course]='数学',[Score]=[数学] from Class union all
select [Student],[Course]='物理',[Score]=[物理] from Class union all
select [Student],[Course]='英语',[Score]=[英语] from Class union all
select [Student],[Course]='语文',[Score]=[语文] from Class)t
order by [Student],[Course]go
--2005:动态:declare @s nvarchar(4000)
select @s=isnull(@s+',','')+quotename(Name)
from syscolumns where ID=object_id('Class') and Name not in('Student')
order by Colid
exec('select Student,[Course],[Score] from Class unpivot ([Score] for [Course] in('+@s+'))b')go
select
Student,[Course],[Score]
from
Class
unpivot
([Score] for [Course] in([数学],[物理],[英语],[语文]))b
生成格式:
/*
Student Course Score
------- ------- -----------
李四 数学 77
李四 物理 85
李四 英语 65
李四 语文 65
张三 数学 87
张三 物理 90
张三 英语 82
张三 语文 78
*/