摘要: 1、查找表中多余的重复记录(根据单个字段studentid) select * from table_name where studentid in (select studentid from table_name group by studentid having count(studentid 阅读全文
posted @ 2016-09-06 15:14 余洪涛 阅读(222) 评论(0) 推荐(0) 编辑