When you have created the CTXCAT index on the AUCTION table, you can query this index with the CATSEARCH operator.
First set the output format to make the output readable:
COLUMN title FORMAT a40;
Now run the query:
SELECT title, price FROM auction WHERE CATSEARCH(title, 'CAMERA', 'order by price')> 0;
TITLE PRICE
--------------- ----------
PENTAX CAMERA 200
CANON CAMERA 250
OLYMPUS CAMERA 300
NIKON CAMERA 400
SELECT title, price FROM auction WHERE CATSEARCH(title, 'CAMERA',
'price <= 300')>0;
TITLE PRICE
--------------- ----------
PENTAX CAMERA 200
CANON CAMERA 250
OLYMPUS CAMERA 300