对于XML显式SQL复制元素

我需要两个元素作为根的子元素出现。它们必须按字母顺序排列，因此元素A必须位于元素Z之前。 ElementZ应该只出现一次，而元素A需要出现很多次。任何帮助必须赞赏。这是一个非常大的查询的一部分，可以防止'path'被使用，所以我需要一个明确的解决方案。对于XML显式SQL复制元素

非常感谢

Declare @xml xml 

DECLARE @tab table (
        root_element nvarchar(10), 
        elementA nvarchar(10), 
        elementZ nvarchar(10) 
        ) 

insert @tab 
(root_element, elementA, elementZ) 
select 'one' , 'many', 'one' union all 
select 'one' , 'many1', 'one' union all 
select 'one' , 'many2', 'one' union all 
select 'one' , 'many3', 'one' union all 
select 'one' , 'many4', 'one' union all 
select 'one' , 'many5', 'one' 

SET @xml =(
    SELECT DISTINCT 
     TAG, 
     Parent, 
     [root_element!1!value], 
     [elementA!2!value], 
     [elementZ!3!value] 
    FROM 
    (
    SELECT DISTINCT 
     1 AS TAG, 
     NULL AS Parent, 
     root_element AS [root_element!1!value], 
     NULL AS [elementA!2!value], 
     NULL AS [elementZ!3!value] 
    FROM @tab 
    UNION ALL 
    SELECT DISTINCT 
     2,  
     1,   
     root_element, 
     elementA, 
     NULL 
    FROM @tab 
    UNION ALL 
    SELECT DISTINCT 
     3,  
     1,   
     root_element, 
     elementA, 
     elementZ 
     FROM @tab 
    )a 
    ORDER BY 
    [root_element!1!value], 
     [elementA!2!value], 
     [elementZ!3!value] 
    FOR XML EXPLICIT 
    ) 

    select @xml 

    --results in this 
    '<root_element value="one"> 
    <elementA value="many" /> 
    <elementZ value="one" /> 
    <elementA value="many1" /> 
    <elementZ value="one" /> 
    <elementA value="many2" /> 
    <elementZ value="one" /> 
    <elementA value="many3" /> 
    <elementZ value="one" /> 
    <elementA value="many4" /> 
    <elementZ value="one" /> 
    <elementA value="many5" /> 
    <elementZ value="one" /> 
</root_element>' 

--but i want this. 
'<root_element value="one"> 
    <elementA value="many" /> 
    <elementA value="many1" /> 
    <elementA value="many2" /> 
    <elementA value="many3" /> 
    <elementA value="many4" /> 
    <elementA value="many5" /> 
    <elementZ value="one" /> 
</root_element>' 
</code>

来源

2011-02-03 Jules

当您创建3标签不重新选择ElementA。这将删除重复项。排序按标签也会把elementA的顶部

SELECT DISTINCT 
     TAG, 
     Parent, 
     [root_element!1!value], 
     [elementA!2!value], 
     [elementZ!3!value] 
    FROM 
    (
    SELECT DISTINCT 
     1 AS TAG, 
     NULL AS Parent, 
     root_element AS [root_element!1!value], 
     NULL AS [elementA!2!value], 
     NULL AS [elementZ!3!value] 
    FROM @tab 
    UNION ALL 
    SELECT DISTINCT 
     2,  
     1,   
     root_element, 
     elementA, 
     NULL 
    FROM @tab 


    UNION SELECT DISTINCT 
     3,  
     1,   
     root_element, 
     NULL, --ElementA 
     elementZ 
     FROM @tab 


    )a 
    ORDER BY 
    TAG, 
    [root_element!1!value], 
     [elementA!2!value], 
     [elementZ!3!value] 
     FOR XML EXPLICIT

如果删除XML明确，并期待在表格输出其更容易一些，看看发生了什么事情错

原始

TAG   Parent  root_element!1!value elementA!2!value elementZ!3!value 
----------- ----------- -------------------- ---------------- ---------------- 
1   NULL  one     NULL    NULL 
2   1   one     many    NULL 
3   1   one     many    one 
2   1   one     many1   NULL 
3   1   one     many1   one 
2   1   one     many2   NULL 
3   1   one     many2   one 
2   1   one     many3   NULL 
3   1   one     many3   one 
2   1   one     many4   NULL 
3   1   one     many4   one 
2   1   one     many5   NULL 
3   1   one     many5   one

修改为空而不是元素A

TAG   Parent  root_element!1!value elementA!2!value elementZ!3!value 
----------- ----------- -------------------- ---------------- ---------------- 
1   NULL  one     NULL    NULL 
3   1   one     NULL    one 
2   1   one     many    NULL 
2   1   one     many1   NULL 
2   1   one     many2   NULL 
2   1   one     many3   NULL 
2   1   one     many4   NULL 
2   1   one     many5   NULL

来源

2011-02-03 16:08:47

对于XML显式SQL复制元素

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