2021年7月26日
去重
摘要： 1、select distinct *from teachers 2、select teacher_id, min(name), min(id_no) from teachers group by teachers_id 3、select *from teacher a where (a.teach 阅读全文
posted @ 2021-07-26 22:04 oceaning 阅读(159) 评论(0) 推荐(0) 编辑