数据库里的数据如果没有指定排序规则,是没有第一行和最后一行的概念的.第一行:$sql="select * from mytable order by id asc limit 0,1"最后一行:$sql="select * from mytable order by id desc limit 0,1"如果是auto_increment的id 可以用取大取小:$sql="select max(id) as field from tablename";$sql="select min(id) as field from tablename"; 20210311