mssql关于一个表格结构的另外一种显示(表达意思不变)_MsSql

create table #tb
(ID int primary key,
Class nvarchar(max),
[Subject] nvarchar(max),
Score int)
insert into #tb values(1,'一(1)班','语文','92')
insert into #tb values(2,'一(1)班','数学','91')
insert into #tb values(3,'一(1)班','英语','93')
insert into #tb values(4,'一(2)班','数学','94')
insert into #tb values(5,'一(2)班','语文','95')
insert into #tb values(6,'一(2)班','英语','96')
insert into #tb values(7,'一(3)班','数学','94')
insert into #tb values(8,'一(3)班','语文','96')
insert into #tb values(9,'一(3)班','英语','97')
select * from #tb

select [Subject], [一(1)班]=[Score]
,[一(2)班]=[Score]
,[一(3)班]=[Score]
from #tb

--观察第二张表，表显然很多成绩是错误的，所以要消除错误

--消除错误的方法:先把错误的成绩设置为0，然后每一行取最大的数作为成绩，并按照科目来分组显示
select subject,[一(1)班]=case when [Class]='一(1)班' then [Score] else 0 end
,[一(2)班]= case when [Class]='一(2)班' then [Score] else 0 end
,[一(3)班]=case when [Class]='一(3)班' then [Score] else 0 end
from #tb

select subject, [一(1)班]=max( case when [Class]='一(1)班' then [Score] else 0 end)
,[一(2)班]=max( case when [Class]='一(2)班' then [Score] else 0 end)
,[一(3)班]=max( case when [Class]='一(3)班' then [Score] else 0 end)
from #tb group by subject

declare @s nvarchar(4000)
set @s=''
Select @s=@s+','+quotename(Class)+'=max( case when [Class]='+quotename(Class,'''')+' then [Score] else 0 end)'
from #tb group by Class
--print @s
exec('select [Subject]'+@s+' from #tb group by [Subject]')

declare @s nvarchar(4000)
set @s=''
Select @s=@s+','+quotename(Class)+'=max( case when [Class]='+quotename(Class,'''')+' then [Score] else 0 end)'
from #tb
where Class in(你想要的班级)
group by Class
--print @s
exec('select [Subject]'+@s+' from #tb group by [Subject]')