Mysql implements paging using the limit starting position and the number of entries per page, but there is no ranking rownum through a three-tier query like oracle, so we have to implement similar functions ourselves
select @rownum:=@rownum+1,tmp.email,tmp.nickName,tmp.score from (
select @rownum:=0,t.email,t.nickName,t.score from table t order by score desc
) tmp
