复制表数据，批量生成测试数据

CREATE TABLE `student` (
  `stuId` int(11) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增id',
  `stuName` varchar(50) NOT NULL DEFAULT '' COMMENT '姓名',
  PRIMARY KEY (`stuId`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='学生表';

先插入一条：insert into student(stuName) values ('张三');

insert into student(stuName) select stuName from student; 执行多次就是了