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Don Burleson Blog 







existsnode tips

Oracle Database Tips by Donald BurlesonJune 5, 2016


The EXISTSNODE is a condition, unlike the others, which can be used in the WHERE condition of an SQL statement. This condition determines whether the traversal of the XML document or an XML element results in an available node or not.


This condition produces the literal 1 if the traversing node is found and 0 if it is not found.


The prototype for defining an EXISTSNODE condition is shown below,


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


The below SQL results in the scalar value of the node Genre only if it is present in the parent XML, else it returns no rows. This logic is handled by the EXISTSNODE condition as shown below,


SELECT extractvalue(book_details_xml,'/Rack1/Genre')

FROM book_store

WHERE existsnode(book_details_xml,'/Rack1/Genre')=1;





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