MySQL select with blob increase performance -


this sql select slow lot of data, how can increase it's run speed in mysql?

select c.car_id, o.start_date, own.name  cars c join orders o on c.car_id = o.car_id  join owner own on o.order_id = own.owner_id  c.wheel not null , c.document null order c.car_id desc;

the document field blob.


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