题解 | #删除emp_no重复的记录，保留最小id
删除emp_no重复的记录，只保留最小的id对应的记录。
https://www.nowcoder.com/practice/3d92551a6f6d4f1ebde272d20872cf05
delete from titles_test
where id not in (
select id
from(
select emp_no, min(id) id
from titles_test
group by emp_no
) k
);
