DEPTH

Syntax

Description of the illustration depth.gif

Purpose

DEPTH is an ancillary function used only with the UNDER_PATH and EQUALS_PATH conditions. It returns the number of levels in the path specified by the UNDER_PATH condition with the same correlation variable.

The correlation_integer can be any NUMBER integer. Use it to correlate this ancillary function with its primary condition if the statement contains multiple primary conditions. Values less than 1 are treated as 1.

See Also:

EQUALS_PATH Condition, UNDER_PATH Condition, and the related function PATH

Examples

The EQUALS_PATH and UNDER_PATH conditions can take two ancillary functions, DEPTH and PATH. The following example shows the use of both ancillary functions. The example assumes the existence of the XMLSchema warehouses.xsd (created in "Using XML in SQL Statements").

SELECT PATH(1), DEPTH(2)
   FROM RESOURCE_VIEW
   WHERE UNDER_PATH(res, '/sys/schemas/OE', 1)=1
     AND UNDER_PATH(res, '/sys/schemas/OE', 2)=1;

PATH(1)                          DEPTH(2)
-------------------------------- --------
/www.oracle.com                         1

/www.oracle.com/xwarehouses.xsd         2