SQL Server 05：在查询中从XML数据类型读取值

Question

我试图从SQL查询中获取XML中的所有属性和节点值。

我试着做下面的事情，但我错过了输出中的几个值。 这里是我的尝试：

DECLARE @Details xml 
SET @Details = '<root> 
    <SelectedCategory CategoryId="101"> 
     <ItemID>120</ItemID> 
     <ItemID>256</ItemID> 
    </SelectedCategory> 
    <SelectedCategory CategoryId="125"> 
     <ItemID>158</ItemID> 
     <ItemID>120</ItemID> 
    </SelectedCategory> 
    <SelectedCategory CategoryId="15"> 
     <ItemID>5986</ItemID> 
     <ItemID>20</ItemID> 
     <ItemID>268</ItemID> 
    </SelectedCategory> 
</root>' 
SELECT 
    SelCat.CatDet.value('(@CategoryId)[1]', 'int') as "CategoryID", 
    SelCat.CatDet.value('.', 'int') as "ItemID" 
FROM @Details.nodes('/root/SelectedCategory') as SelCat(CatDet) 

这是显示输出：

CategoryID  ItemID 
101   120256 
125   158120 
15   598620268 

虽然所需的输出可以在以下任一：

CategoryID  ItemID 
    101  120 
    101  256 
    125  158 
    125  120 
    15  5986 
    15   20 
    15   268 

OR

CategoryID  ItemID 
    101  120 
    NULL  256 
    125  158 
    NULL  120 
    15  5986 
    NULL  20 
    NULL  268 

任何人都知道如何做到这一点？

Answer 1

尝试是这样的

DECLARE @Details xml 
    SET @Details = '<root> 
     <SelectedCategory CategoryId="101"> 
      <ItemID>120</ItemID> 
      <ItemID>256</ItemID> 
     </SelectedCategory> 
     <SelectedCategory CategoryId="125"> 
      <ItemID>158</ItemID> 
      <ItemID>120</ItemID> 
     </SelectedCategory> 
     <SelectedCategory CategoryId="15"> 
      <ItemID>5986</ItemID> 
      <ItemID>20</ItemID> 
      <ItemID>268</ItemID> 
     </SelectedCategory> 
    </root>' 

    SELECT T.[CategoryID], 
      T2.Loc.query('.').value('.', 'INT') Val 
    FROM 
     ( 
      SELECT 
       SelCat.CatDet.value('(@CategoryId)[1]', 'int') as CategoryID, 
       SelCat.CatDet.query('.') as ItemID 
      FROM @Details.nodes('/root/SelectedCategory') as SelCat(CatDet) 
     ) T 
     CROSS APPLY ItemID.nodes('/SelectedCategory/ItemID') as T2(Loc)