2019年9月19日
SQL
摘要： --数据库多字段去重delete from student a where (a.no,a.name,a.science)in (select a.no,a.name,a.science from student a group by a.no,a.name,a.science having cou 阅读全文
posted @ 2019-09-19 11:06 凉了记忆 阅读(281) 评论(0) 推荐(0) 编辑