今天以前的同學問我關於這方面的SQL語句，我特意記憶一下，畢竟這個也比較常見了

select * from (select * from member_payment 
                order by id desc) t group by member_id limit 10

缺點很明顯：Using temporary; Using filesort

select s.* 
from (SELECT max(id) as id FROM `member_payment` group by `member_id` limit 10) t 
left join `member_payment` as s on t.id=s.id 
 

select * from `member_payment` where EXISTS (
	select `id` from (
		SELECT max(`id`) as id FROM `member_payment` group by `member_id` limit 10) t 
	where t.`id`=`member_payment`.`id`
)

第三種是子查詢

竊以為第二種效率最高