摘要: 先看以下SQL以及执行结果: select * from student s left join class c on s.classId=c.id order by s.id select * from student s left join class c on s.classId=c.id a 阅读全文
posted @ 2021-04-19 10:40 KILLNPE 阅读(167) 评论(0) 推荐(0) 编辑