At 18:07 -0800 2/10/02, Jeremy Zawodny wrote: >On Sun, Feb 10, 2002 at 02:53:53PM -0500, Matthew Dougherty wrote: >> If I use a REGEXP query on an indexed column using something like: >> Field REGEXP '^A|^B|^C' >> >> Will MySQL use the index like it would if I used Field LIKE 'A%' or >> Field LIKE 'B%' or FIeld LIKE 'C%' ?? > >It will not. > >Regular expressions are best used when you need something more complex >than what "%" allows you to achieve.
Not to mention that an index won't be used even for the LIKE expression, because it uses OR. At least, I think it won't be. >Jeremy >-- >Jeremy D. Zawodny, <[EMAIL PROTECTED]> >Technical Yahoo - Yahoo Finance >Desk: (408) 349-7878 Fax: (408) 349-5454 Cell: (408) 685-5936 > >MySQL 3.23.47-max: up 3 days, processed 121,771,991 queries (403/sec. avg) --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
