日期:2014-05-17 浏览次数:20627 次
--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+',','') 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('selec