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Re: optimize IP range join: postgresql is 496 times faster
Posted by: Rick James
Date: December 10, 2008 10:46AM

With a lot of assumptions, this may be quite fast:
* your ranges do not overlap
* you have countries for all addresses
* you have an index on begin_num
     ( select r.id_country from range r
       where a.address >= r.begin_num
       order by r.begin_num
       limit 1
     ) as id_country
   from address a

Postgres seems to have some "range" optimizations that MySQL does not have.

Please use SHOW CREATE TABLE xxx; instead of DESCRIBE xxx; -- the former is clearer on indexes.

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