题解 | #插入记录（二）#
插入记录（二）
http://www.nowcoder.com/practice/9681abf28745468c8adacb3b029a18ce
- 需要一些条件，而且要排除空值
INSERT INTO exam_record_before_2021 (uid, exam_id, start_time, submit_time, score)
SELECT uid, exam_id, start_time, submit_time, score
FROM exam_record
WHERE (YEAR(start_time) < '2021') and (NOT ISNULL(score));
