At 12:43 AM 8/30/2011, mysql-plain-digest-h...@lists.mysql.com wrote: >Not useful to add an index for that. I also wonder why the value is null >(meaning: unknown, not certain) for almost all records.
It depends on if you want the forest or the trees. A frequently executed query asks for just the robots. An index is an efficient way to select 6 of 20,000. As for why the rest are null, null is just a a random everything else value, left over from before the "is_robot" column was added. Is there a better way to mark a small number of "special" records in a big data set? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
