group-by - mysql中group by之后order by无效 创建一张表(比如说帖子回复表,简单的几个字段) create table replies( id int unsigned primary key auto_increment, uid int unsigned not null default 0, tid int unsigned not null default 0, content varchar(1 .. 发布时间:2017-09-06 11:55:04 order-by group-by mysql 数据库