The existsnode() XML function
Determines whether the XPath evaluation results in at least one XML element.
Purpose
Determines whether traversal of an XML document using a specified path results in any nodes. Returns 1 if one or more nodes are found; otherwise, returns 0.
The existsnode() syntax
Parameters
- xml_document
- The XML document or fragment to evaluate. The document can be of type LVARCHAR or CLOB.
- xpath_expression
- The XPATH expression to search for XML nodes.
Specify an absolute XPath_string with an initial slash. Omit the initial slash to indicate a path relative to the root node. If no match is found, these functions return an empty string.
Example 1
This example query returns a list
of warehouse IDs and names for every warehouse that has an associated
dock.
SELECT warehouse_id, warehouse_name
FROM warehouses
WHERE existsnode(warehouse_spec, '/Warehouse/Docks') = 1;