Periodically, you need to search a database for specific words or phrases in strings. Users of a music Web site might need to search for CD titles; a bookselling site might offer searches by title or author. Queries that use the LIKE keyword are notoriously slow for this type of search because typical database indexes can't help in searching for words that appear in the middle of a string — such indexes help only in searching from the beginning of a string. To address the need for better te...