百万级别表的limit优化:
select * from code order by id limit 1000000,10
执行时间:0.622
select a.* from code a inner join (select id from code order by id limit 1000000,10) b USING(id)
执行时间:0.235s
select * from code where id>=(select id from code order by id limit 1000000,1) limit 10;
执行时间:0.235s
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