I am relatively new with PHP and have a problem using the SELECT function. While accessing a 66,000 record database, I am attempting to read CITY, STATE, AND ZIP. The file has as one of its indexes CITY STATE ZIP. However, I have noticed that the read is very slow when there are many identical CITY STATE with various zipcodes, and rapid when only a few. How could this be? An indexed search should immediately retrieve the correct CITY STATE and...