This version of MySQL doesn’t yet support ‘LIMIT & IN/ALL/ANY/SOME

  

select sum(level_exp) from experience where id in(select id from experience order by level asc  limit 5 )

原因是在in中不支持limit函数，修改办法

select sum(level_exp) from(select level_exp from experience order by level asc  limit 5 ) as data

将数据转换成表