- Original Message -
> From: "Dave Dyer"
>
> 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, l
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 t
