题解 | #插入记录（二）#

• 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));