This function is for use with feature extraction models that have been created using the
DBMS_DATA_MINING package or with the Oracle Data Mining Java API. It returns the value of a given feature. If you omit the
feature_id argument, then the function returns the highest feature value. You can use this form in conjunction with the
FEATURE_ID function to obtain the largest feature/value combination.
mining_attribute_clause behaves as described for the
PREDICTION function. Please refer to mining_attribute_clause.
The following example lists the customers that correspond to feature 3, ordered by match quality.
This example and the prerequisite data mining operations, including the creation of the model and view, can be found in the demo file
$ORACLE_HOME/rdbms/demo/dmnmdemo.sql. General information on data mining demo files is available in Oracle Data Mining Administrator's Guide. The example is presented here to illustrate the syntactic use of the function.
SELECT * FROM (SELECT cust_id, FEATURE_VALUE(nmf_sh_sample, 3 USING *) match_quality FROM nmf_sh_sample_apply_prepared ORDER BY match_quality DESC) WHERE ROWNUM < 11; CUST_ID MATCH_QUALITY ---------- ------------- 100210 19.4101627 100962 15.2482251 101151 14.5685197 101499 14.4186292 100363 14.4037396 100372 14.3335148 100982 14.1716545 101039 14.1079914 100759 14.0913761 100953 14.0799737 10 rows selected.