题解 | #删除emp_no重复的记录,只保留最小的id对应的记录。#
删除emp_no重复的记录,只保留最小的id对应的记录。
http://www.nowcoder.com/practice/3d92551a6f6d4f1ebde272d20872cf05
尽量不用SELECT * 吧!!!!
delete from titles_test where id not in ( select a.id from ( select id from titles_test group by emp_no ) a );