sql;"> select years,(select amount from Tb_Amount as A where month=1 and A.years=Tb_Amount.years)as m1,(select amount from Tb_Amount as A where month=2 and A.years=Tb_Amount.years)as m2,(select amount from Tb_Amount as A where month=3 and A.years=Tb_Amount.years)as m3 from Tb_Amount group by years

sql;"> select years as 年份,sum(case when month='1' then amount end) as 一月,sum(case when month='2' then amount end) as 二月,sum(case when month='3' then amount end) as 三月 from dbo.Tb_Amount group by years order by years desc

sql;"> select uname as 姓名,SUM(case when era='年轻' then amount end) as 年轻,SUM(case when era='中年' then amount end) as 中年,SUM(case when era='老年' then amount end) as 老年 from Tb_People group by uname order by uname desc

sql;"> select sname as 姓名,max(case Subject when '语文' then grade else 0 end) as 语文,max(case Subject when '数学' then grade else 0 end) as 数学,max(case Subject when '英语' then grade else 0 end) as 英语 from dbo.Tb_Student group by sname order by sname desc

sql;"> declare @sql varchar(8000) set @sql = 'select sname as ' + '姓名' select @sql = @sql + ',max(case Subject when ''' + Subject + ''' then grade else 0 end) [' + Subject + ']' from (select distinct Subject from Tb_Student) as a set @sql = @sql + ' from Tb_Student group by sname order by sname desc' exec(@sql)

sql;"> select t.sname AS 姓名,sum(decode(t.subject,'语文',grade,null))语文,'数学',null)) 数学,'英语',null)) 英语 from Tb_Student t group by sname order by sname desc

sql;"> select * from (select sname,[Course ] ='数学',[score]=[数学] from Tb_students union all select sname,[Course]='英语',[score]=[英语] from Tb_students union all select sname,[Course]='语文',[score]=[语文] from Tb_students)t order by sname,case [Course] when '语文' then 1 when '数学' then 2 when '英语' then 3 end go --列转行的静态方案：UNPIVOT,sql2005及以后版本

SELECT sname,Subject,grade
from dbo.Tb_students
unpivot(grade for Subject in([语文],[数学],[英语]))as up
GO

--列转行的动态方案：UNPIVOT,sql2005及以后版本
--因为行是动态所以这里就从INFORMATION_SCHEMA.COLUMNS视图中获取列来构造行，同样也使用了XML处理。
declare @s nvarchar(4000)
select @s=isnull(@s+',','')+quotename(Name)
from syscolumns where ID=object_id('Tb_students') and Name not in('sname')
order by Colid
exec('select sname,[Subject],[grade] from Tb_students unpivot ([grade] for [Subject] in('+@s+'))b')

go
select
sname,[grade]
from
Tb_students
unpivot
([grade] for [Subject] in([数学],[英语],[语文]))b