Loading

摘要: 一、视图 视图是将SQL语句的查询结果当做虚拟表实体化保存起来,以后可以反复使用 create view teacher2course as select * from teacher inner join course on teacher.tid = course.teacher_id; dro 阅读全文
posted @ 2022-02-24 00:31 JZEason 阅读(112) 评论(0) 推荐(0) 编辑