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問題描述
限時送ChatGPT賬號..
我有以下 XML 結構:
I have the following XML structure:
<root>
<parent>
<parent_id>1</parent_id>
<parent_value>10000</parent_value>
<child>
<child_id>11</child_id>
<other_value>1000</other_value>
</child>
<child>
<child_id>12</child_id>
<other_value>1000</other_value>
</child>
</parent>
</root>
預期輸出:
CHILD_ID PARENT_VALUE
---------- ------------
11 10000
12 10000
我嘗試過的:
WITH xtbl AS (SELECT xmltype ('<root>
<parent>
<parent_id>1</parent_id>
<parent_value>10000</parent_value>
<child>
<child_id>11</child_id>
<other_value>1000</other_value>
</child>
<child>
<child_id>12</child_id>
<other_value>1000</other_value>
</child>
</parent>
</root>') AS xcol FROM dual)
SELECT myXmlTable.*
FROM xtbl
CROSS JOIN
xmltable ('/root/parent/child'
PASSING xcol
COLUMNS child_id NUMBER (5) PATH 'child_id',
parent_value NUMBER (10) PATH './parent_value') myXmlTable;
我的查詢的問題是 parent_value 為空.請幫忙.
Problem with my query is that parent_value comes to be null. Please help.
推薦答案
您正在尋找./parent_node，它是一個
You are looking for ./parent_node, which is a <parent_node> under the current <child> node. And that doesn't exist.
你只需要提升一個層次:
You just need to go up a level:
parent_value NUMBER (10) PATH './../parent_value'
使用您的 CTE 進行演示并添加 ../:
Demo with your CTE and just that added ../:
WITH xtbl AS (SELECT xmltype ('<root>
<parent>
<parent_id>1</parent_id>
<parent_value>10000</parent_value>
<child>
<child_id>11</child_id>
<other_value>1000</other_value>
</child>
<child>
<child_id>12</child_id>
<other_value>1000</other_value>
</child>
</parent>
</root>') AS xcol FROM dual)
SELECT myXmlTable.*
FROM xtbl
CROSS JOIN
xmltable ('/root/parent/child'
PASSING xcol
COLUMNS child_id NUMBER (5) PATH 'child_id',
parent_value NUMBER (10) PATH './../parent_value') myXmlTable;
CHILD_ID PARENT_VALUE
---------- ------------
11 10000
12 10000
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