摘要: 场景如下,mysql根据用户u_id查询课程,不过该用户的课程为多列数据 table users table curriculums 查询语句 select * from users as u join curriculums as c on c.u_id = u.u_id where c.u_id 阅读全文
posted @ 2020-08-11 05:15 花名k 阅读(2245) 评论(0) 推荐(0) 编辑