-- Add a sort_key for the area table and populate it with the area_name.
-- Just in case the area_name column has been extended, truncate the area_name when copying it into the sort_key

ALTER TABLE %DB_TBL_PREFIX%area
  ADD COLUMN `sort_key` varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT '' NOT NULL AFTER `area_name`;
  
UPDATE %DB_TBL_PREFIX%area
  SET `sort_key`=SUBSTR(`area_name`, 1, 30);