delimiter //

CREATE PROCEDURE countMobCardsBySection()
BEGIN
  DECLARE x INT DEFAULT 0;
  DECLARE I INT DEFAULT 0;
  WHILE I < 10 DO
    SELECT count(*) INTO x FROM (
      SELECT DISTINCT itemid FROM drop_data WHERE itemid >= (2380000 + I*1000) and itemid < (2380000 + (I+1)*1000)
    ) AS anysqltab_;

    insert into `_mob_card_counter` (`keyid`,`count`) values (2380000 + I*1000 , x);
    SET I = I + 1;
  END WHILE;
END;

//

delimiter ;

CREATE TABLE `_mob_card_counter` (
    `keyid` INTEGER(10),
    `count` INTEGER(10)
);

CALL countMobCardsBySection();

# the query below recovers all MAIN mobs that drops card.
SELECT cardid, mobid FROM monstercarddata LEFT JOIN drop_data ON monstercarddata.cardid = drop_data.itemid WHERE mobid = dropperid;