表中的列转行。行数为字段数量

declare @cols Nvarchar(2000)

declare @cols1 Nvarchar(2000)

declare @cols2 Nvarchar(2000)

declare @cols3 Nvarchar(2000)

declare @cols4 Nvarchar(2000)

set @cols=''

set @cols1=''

set @cols2=''

set @cols3=''

set @cols4=''



select  @cols=@cols+N',sum((case when D_Model=N'''+CAST(D_Model AS NVARCHAR(10))+N''' then CAST(D_Temp2 AS INT) else 0 end )) as ['+CAST(D_Model AS NVARCHAR(10))+'] '  

 ,@cols1=@cols1+N',sum((case when D_Model=N'''+CAST(D_Model AS NVARCHAR(10))+N''' then CAST(D_Temp3 AS INT) else 0 end )) as ['+CAST(D_Model AS NVARCHAR(10))+'] '  

 ,@cols2=@cols2+N',sum((case when D_Model=N'''+CAST(D_Model AS NVARCHAR(10))+N''' then CAST(D_Temp4 AS INT) else 0 end )) as ['+CAST(D_Model AS NVARCHAR(10))+'] '  

, @cols3=@cols3+N',sum((case when D_Model=N'''+CAST(D_Model AS NVARCHAR(10))+N''' then CAST(D_Temp5 AS INT) else 0 end )) as ['+CAST(D_Model AS NVARCHAR(10))+'] '  

, @cols4=@cols4+N',sum((case when D_Model=N'''+CAST(D_Model AS NVARCHAR(10))+N''' then CAST(D_Temp6 AS INT) else 0 end )) as ['+CAST(D_Model AS NVARCHAR(10))+'] '  

from (SELECT DISTINCT D_Model  FROM device GROUP BY D_Model) AS T



EXEC(  N'select ''[型号或规格]'' '+@cols+N' from device union all '+

 N'select ''[封装]'' '+@cols1+N' from device union all '+

 N'select ''[外形尺寸]'' '+@cols2+N' from device union all '+

 N'select ''[脚距]'' '+@cols3+N' from device union all '+

 N'select ''[脚直径]'' '+@cols4+N' from device  '

)

create table device

(

    D_ID int IDENTITY(1,1) NOT NULL,

    D_Model nvarchar(50),                          --分类

    D_Temp2 nvarchar(50),                    --型号或规格

    D_Temp3 nvarchar(50),                --封装

    D_Temp4 nvarchar(50),                --外形尺寸

    D_Temp5 nvarchar(50),                --脚距

    D_Temp6 nvarchar(50)                --脚直径

)

go

insert into device values(N'电阻','1','2','3','4','5')

insert into device values(N'电阻','11','22','33','44','55')

insert into device values(N'电容','12','23','34','45','56')

insert into device values(N'电阻2','13','24','35','46','57')

insert into device values(N'电阻1','22','32','43','54','65')

insert into device values(N'电阻','15','26','30','44','56')

insert into device values(N'电阻3','17','28','63','84','55')

insert into device values(N'电阻4','15','42','53','74','56')

 







   if object_id('tb') is not null 

   drop table tb 

 select id=identity(int,1,1),d_model into tb from   device group by d_model



 



CREATE FUNCTION DBO.F_STR2(@LB VARCHAR(50),@ID INT )  --STR2

RETURNS VARCHAR(8000)

AS 

BEGIN

  declare @str2  varchar(1000)

   set @str2 = ''

    select @str2 = @str2 + ',' + cast(a.d_temp2 as varchar) from 

( select a.d_model,id,a.d_temp2  from (select a.*,b.id from device a left join tb b on a.d_model=b.d_model) a group by a.d_model,id,a.d_temp2  )a

 where A.d_model = @LB and id=@id

    set @str2 = right(@str2 , len(@str2)-1)

 RETURN  @STR2

END

GO



CREATE FUNCTION DBO.F_STR3(@LB VARCHAR(50),@ID INT )  --STR3

RETURNS VARCHAR(8000)

AS 

BEGIN

    declare @str3  varchar(1000)

    set @str3 = ''

    select @str3 = @str3 + ',' + cast(a.d_temp3 as varchar) from 

( select a.d_model,id,a.d_temp3  from (select a.*,b.id from device a left join tb b on a.d_model=b.d_model) a group by a.d_model,id,a.d_temp3  )a

 where A.d_model = @LB and id=@id

    set @str3 = right(@str3 , len(@str3)-1)

 RETURN  @STR3

END

GO

  

CREATE FUNCTION DBO.F_STR4(@LB VARCHAR(50),@ID INT )  --STR4

RETURNS VARCHAR(8000)

AS 

BEGIN

  declare @str4  varchar(1000)

    set @str4 = ''

    select @str4 = @str4 + ',' + cast(a.d_temp4 as varchar) from 

( select a.d_model,id,a.d_temp4  from (select a.*,b.id from device a left join tb b on a.d_model=b.d_model) a group by a.d_model,id,a.d_temp4 )a

 where A.d_model = @LB and id=@id

   set @str4 = right(@str4 , len(@str4)-1)

 RETURN  @STR4 

END

GO



CREATE FUNCTION DBO.F_STR5(@LB VARCHAR(50),@ID INT )  --STR5

RETURNS VARCHAR(8000)

AS 

BEGIN

    declare @str5  varchar(1000) 

    set @str5 = ''

    select @str5 = @str5 + ',' + cast(a.d_temp5 as varchar) from 

( select a.d_model,id,a.d_temp5  from (select a.*,b.id from device a left join tb b on a.d_model=b.d_model) a group by a.d_model,id,a.d_temp5  )a

 where A.d_model = @LB and id=@id

    set @str5 = right(@str5 , len(@str5)-1)

 RETURN  @STR5

END

GO





CREATE FUNCTION DBO.F_STR6(@LB VARCHAR(50),@ID INT )  --STR6

RETURNS VARCHAR(8000)

AS 

BEGIN



    declare @str6  varchar(1000)

    set @str6 = ''

    select @str6 = @str6 + ',' + cast(a.d_temp6 as varchar) from 

( select a.d_model,id,a.d_temp6  from (select a.*,b.id from device a left join tb b on a.d_model=b.d_model) a group by a.d_model,id,a.d_temp6  )a

 where A.d_model = @LB and id=@id

   

     set @str6 = right(@str6 , len(@str6)-1)

 RETURN  @STR6

END

GO



SELECT  d_model,m2=dbo.F_STR2(d_model,id),m3=dbo.F_STR3(d_model,id),m4=dbo.F_STR4(d_model,id), m5=dbo.F_STR5(d_model,id),

         m6=dbo.F_STR6(d_model,id)



FROM TB  order by id