The newspaper had added a special deal for the classified ads online. For a small fee, the words "BEST BUY" are added to the text of the ad, and these ads are listed on a special "Best Buy" page online. The online classified section has a query to bring up all the ads that qualify, but it runs very slowly. Here is the query.
SELECT AD_TEXT, AD_NO
WHERE INSTR(AD_TEXT, 'BEST BUY') > 0