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;
Result:
Comics
|
|
|
|
|
Oracle Training from Don Burleson
The best on site
"Oracle
training classes" are just a phone call away! You can get personalized Oracle training by Donald Burleson, right at your shop!
|
|
|
|
| |
|
Burleson is the American Team
Note:
This Oracle
documentation was created as a support and Oracle training reference for use by our
DBA performance tuning consulting professionals.
Feel free to ask questions on our
Oracle forum.
Verify
experience!
Anyone
considering using the services of an Oracle support expert should
independently investigate their credentials and experience, and not rely on
advertisements and self-proclaimed expertise. All legitimate Oracle experts
publish
their Oracle
qualifications.
Errata?
Oracle technology is changing and we
strive to update our BC Oracle support information. If you find an error
or have a suggestion for improving our content, we would appreciate your
feedback. Just
e-mail:
 and include the URL for the page.
Copyright © 1996 - 2017
All rights reserved by
Burleson
Oracle ®
is the registered trademark of Oracle Corporation.
Remote Emergency Support provided by
Conversational
|
|
