This query is taking too long to execute… Any advice to speed it up would be appreciated. Thanks
select max(t1.result / t2.result) as 'result' from(select h.trainer_id, count(*) as 'result' from horse_result h join conditions c on h.conditions_id=c.conditions_id where c.race_date between '2010-01-01' and '2012-12-31' and h.finishing_position='1' group by h.trainer_id) t1 join (select h.trainer_id, count(*) as 'result' from horse_result h join conditions c on h.conditions_id=c.conditions_id where c.race_date between '2010-01-01' and '2012-12-31' group by h.trainer_id having result > 30) t2 on t1.trainer_id=t2.trainer_id;
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