摘要: 根据老师表(teacher),老师任课关系表(teacher2class),课程表(class),通过表连接,得到老师的任课结构表,如下: select t.id, t.name, c.title from teacher t left join teacher2class t2c on t.id 阅读全文
posted @ 2020-08-24 12:34 lqqgis 阅读(3297) 评论(0) 推荐(0) 编辑