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deletexml tips

Oracle Database Tips by Donald BurlesonJune 5, 2016


This function deletes a user supplied XML tag from the target XML document or an XML element, which matches the path provided as the XPath expression.


The prototype for defining an DELETEXML function is shown below,


DELETEXML(<XML_Document> | <XML_Element>, <XPath_Expression>)


The SQL deletes the Cost tag from the parent XML document as shown below,


UPDATE book_store

SET book_details_xml=deletexml(book_details_xml,'/Rack1/Cost')

WHERE book_id       =1001;


1 rows updated.


After the Cost tag is deleted from the parent XML document, the EXTRACTVALUE function returns Null for that tag as it is not available anymore as shown below.


select extractvalue(book_details_xml,'/Rack1/Cost') from book_store;





DELETEXML removes elements from the document.


      <CANTON ID="VD">
      <CANTON ID="NE">
      <CANTON ID="GE">
      <CANTON ID="JU">

The inner DELETEXMLremoves the cantons with a language different than French and the outer DELETEXML removes every DETAILS instance.



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