有时候会用到查询倒数第二条记录
last=HolderChangeHistory.find_by_sql
([" SELECT * FROM holder_change_histories
where treasure_id = ?
order by id desc
limit 1,1 ",
@hch.treasure_id])
select *
from tablename a
where (
select count(*)
from tablename b
where a.id<b.id)=1
select *
from tb1
order by tb1.id desc
limit 1,1;