返回嵌套XML重复列

Question

我有一个看起来像这样的表，把代码适当地（特别是XML结构和查询）

Class Subclass Information Details 
Classx subclassx Info1  otherinfo1 
Classx subclassx Info2 
Classx subclassy info3 
Classyy subclassyyy info3 

作为一个例子，我需要返回与类过滤行='classx ”，返回：

<Class Name="Classx"> 
    <Subclass subclassName ="subclassx"> 
    <Info>Info1</Info> 
    <Info>Info2</Info> 
    </Subclass> 
<Subclass subclassName ="subclassy"> 
    <Info>Info3</Info> 
    </Subclass> 
</Class> 

（或）

<Class Name="Classx"> 
    <Subclass>subclassx 
    <Info>Info1</Info> 
    <Info>Info2</Info> 
    </Subclass> 
<Subclass>subclassy 
    <Info>Info3</Info> 
</Subclass> 
</Class> 

东西巢 '子类' 内部 '类' 元件， d'Info'在'Subclass'元素中。

某些查询尝试：

DECLARE @classFilter nvarchar(15); 
SELECT @classFilter = 'Classx' 

    SELECT @classFilter as '@Class', 
       (SELECT r1.subClass as 'SubClass', 
       (SELECT DISTINCT r1.Info as 'Info' 
        FROM @results as r2 
        WHERE r2.Class= @classFilter and r1.Subclass = r2.Subclass 
        FOR XML PATH('Information'), TYPE 
        ) 
       FROM @results r1 
       GROUP BY r1.Class, r1.SubClass, r1.Info 
       HAVING r1.Class= @classFilter 
       FOR XML PATH('Subclasses'), TYPE) 
      FOR XML PATH('Class'), TYPE; 

给出：

<Class Class="Classx"> 
    <Subclasses> 
    <SubClass>subclassx</SubClass> 
    <Information> 
     <Info>Info1</Info> 
    </Information> 
    </Subclasses> 
<Subclasses> 
    <SubClass>subclassx</SubClass> 
    <Information> 
     <Info>Info2</Info> 
    </Details> 
    </Subclasses> 
<Subclasses> 
    <SubClass>subclassy</SubClass> 
    <Information> 
     <Info>Info3</Info> 
    </Information> 
    </Subclasses> 
</Class> 

我能来最接近的是

SELECT @classfilter as '@Name', --or r1.Class 
     (SELECT r1.Subclass as '@Subclass', 
      (SELECT DISTINCT r1.Information as 'Information' 
       FROM @results as r2 
       WHERE r2.Class = @classFilter and r1.Subclass = r2.Subclass   
       ) 
      FROM @results r1   
      GROUP BY r1.Class, r1.Subclass, r1.Information 
      HAVING r1.Class= @classFilter 
      FOR XML PATH('Subclasses'), TYPE) 
     FOR XML PATH('Class'), TYPE; 

给出：

<Class Name="classx"> 
     <Subclasses subclass="subclassx">Info1</Subclasses> 
     <Subclasses subclass="subclassx">Info2</Subclasses> 
     <Subclasses subclass="subclassy">Info3</Subclasses> 
    </Class> 

想知道我错过了什么！

Answer 1

declare @T table 
(
    Class varchar(10), 
    Subclass varchar(10), 
    Information varchar(10), 
    Details varchar(10) 
) 

insert into @T 
select 'Classx', 'subclassx', 'Info1', 'otherinfo1' union all 
select 'Classx', 'subclassx', 'Info2', '' union all 
select 'Classx', 'subclassy', 'info3', '' union all 
select 'Classyy', 'subclassyy', 'info3', '' 

declare @class varchar(10) 
set @class = 'Classx' 

select 
    T.Class as '@Name', 
    (select 
    T2.Subclass as '@subclassName', 
    (select 
     T3.Information as 'Info' 
     from @T as T3 
     where T3.Subclass = T2.Subclass and 
      T3.Class = T.Class 
     for xml path(''), type) 
    from @T as T2 
    where T.Class = T2.Class 
    group by T2.Subclass 
    for xml path('Subclass'), type) 
from @T as T 
where T.Class = @class 
group by T.Class 
for xml path('Class')