--行列互转 /****************************************************************************************************************************************************** 以学生成绩为例子,比较形象易懂 ******************************************************************************************************************************************************/--1、行互列 --> --> (Roy)生成測試數據if not object_id('Class') is 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] 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] 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]=sum([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 --> --> (Roy)生成測試數據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(8 行受影响) */
--> 生成测试数据: @T DECLARE @T TABLE (列1 VARCHAR(4),列2 VARCHAR(2)) INSERT INTO @T SELECT 'AAAA','BB' UNION ALL SELECT 'AAAA','DD' UNION ALL SELECT 'BBBB','EE' UNION ALL SELECT 'BBBB','FF' UNION ALL SELECT 'BBBB','GG' UNION ALL SELECT 'CCCC','HH'--SQL查询如下:SELECT 列1, 列2=MAX(CASE WHEN RID=1 THEN 列2 ELSE '' END), 列3=MAX(CASE WHEN RID=2 THEN 列2 ELSE '' END), 列4=MAX(CASE WHEN RID=3 THEN 列2 ELSE '' END) FROM ( SELECT *, RID=ROW_NUMBER() OVER(PARTITION BY 列1 ORDER BY 列2) FROM @T ) AS A GROUP BY 列1/* 列1 列2 列3 列4 ---- ---- ---- ---- AAAA BB DD BBBB EE FF GG CCCC HH (3 行受影响) */
--> 生成测试数据: #T IF OBJECT_ID('tempdb.dbo.#T') IS NOT NULL DROP TABLE #T CREATE TABLE #T (列1 VARCHAR(4),列2 VARCHAR(2)) INSERT INTO #T SELECT 'AAAA','BB' UNION ALL SELECT 'AAAA','DD' UNION ALL SELECT 'BBBB','EE' UNION ALL SELECT 'BBBB','FF' UNION ALL SELECT 'BBBB','GG' UNION ALL SELECT 'CCCC','HH'--SQL查询如下:DECLARE @sql VARCHAR(8000) DECLARE @i INTSELECT @sql='',@i=1SELECT @sql=@sql+',MAX(CASE WHEN RID='+RTRIM(RID)+' THEN 列2 ELSE '''' END) AS [列'+RTRIM(@i)+']', @i=@i+1 FROM( SELECT DISTINCT RID FROM( SELECT RID=( SELECT COUNT(*) FROM #T WHERE 列1=A.列1 AND 列2>=A.列2 ) FROM #T AS A ) AS T ) AS AEXEC(' SELECT 列1'+@sql+' FROM( SELECT 列1, 列2, RID=( SELECT COUNT(*) FROM #T WHERE 列1=A.列1 AND 列2>=A.列2 ) FROM #T AS A ) AS A GROUP BY 列1 ')/* 列1 列1 列2 列3 ---- ---- ---- ---- AAAA DD BB BBBB GG FF EE CCCC HH (3 行受影响) */
--行列互转
/******************************************************************************************************************************************************
以学生成绩为例子,比较形象易懂
******************************************************************************************************************************************************/--1、行互列
--> --> (Roy)生成測試數據if not object_id('Class') is 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]
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]
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]=sum([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
--> --> (Roy)生成測試數據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(8 行受影响)
*/
-- Author: liangCK 小梁
---------------------------------
--> 生成测试数据: @T
DECLARE @T TABLE (列1 VARCHAR(4),列2 VARCHAR(2))
INSERT INTO @T
SELECT 'AAAA','BB' UNION ALL
SELECT 'AAAA','DD' UNION ALL
SELECT 'BBBB','EE' UNION ALL
SELECT 'BBBB','FF' UNION ALL
SELECT 'BBBB','GG' UNION ALL
SELECT 'CCCC','HH'--SQL查询如下:SELECT
列1,
列2=MAX(CASE WHEN RID=1 THEN 列2 ELSE '' END),
列3=MAX(CASE WHEN RID=2 THEN 列2 ELSE '' END),
列4=MAX(CASE WHEN RID=3 THEN 列2 ELSE '' END)
FROM (
SELECT
*,
RID=ROW_NUMBER() OVER(PARTITION BY 列1 ORDER BY 列2)
FROM @T
) AS A
GROUP BY 列1/*
列1 列2 列3 列4
---- ---- ---- ----
AAAA BB DD
BBBB EE FF GG
CCCC HH (3 行受影响)
*/
你这是2005的,我的是2000,而且不确定有多少个,精华贴里的是把行转为列标题。
做了些调整得到下面的结果,但我想要的不是这样:列1 BB DD EE FF GG HH
---- ---- ---- ---- ---- ---- ----
AAAA BB DD
BBBB EE FF
CCCC HH
-- Author: liangCK 小梁
---------------------------------
--> 生成测试数据: #T
IF OBJECT_ID('tempdb.dbo.#T') IS NOT NULL DROP TABLE #T
CREATE TABLE #T (列1 VARCHAR(4),列2 VARCHAR(2))
INSERT INTO #T
SELECT 'AAAA','BB' UNION ALL
SELECT 'AAAA','DD' UNION ALL
SELECT 'BBBB','EE' UNION ALL
SELECT 'BBBB','FF' UNION ALL
SELECT 'BBBB','GG' UNION ALL
SELECT 'CCCC','HH'--SQL查询如下:DECLARE @sql VARCHAR(8000)
DECLARE @i INTSELECT @sql='',@i=1SELECT
@sql=@sql+',MAX(CASE WHEN RID='+RTRIM(RID)+' THEN 列2 ELSE '''' END) AS [列'+RTRIM(@i)+']',
@i=@i+1
FROM(
SELECT DISTINCT
RID
FROM(
SELECT
RID=(
SELECT COUNT(*)
FROM #T
WHERE 列1=A.列1
AND 列2>=A.列2
)
FROM #T AS A
) AS T
) AS AEXEC('
SELECT 列1'+@sql+'
FROM(
SELECT
列1,
列2,
RID=(
SELECT COUNT(*)
FROM #T
WHERE 列1=A.列1
AND 列2>=A.列2
)
FROM #T AS A
) AS A
GROUP BY 列1
')/*
列1 列1 列2 列3
---- ---- ---- ----
AAAA DD BB
BBBB GG FF EE
CCCC HH (3 行受影响)
*/
---- ---- ---- ---- ---- ----
AAAA DD BB EE
BBBB GG FF EE
CCCC GG HH