题解 | #插入记录（三）#

如果原表有重复数据，需要先删除，不然会出现重复数据

方法一：
insert into examination_info(exam_id,tag,difficulty,duration,release_time)
VALUES('SQL','hard', 90, '2021-01-01 00:00:00')
方法二：
DELETE FROM examination_info
WHERE exam_id=9003;
INSERT INTO examination_info
VALUES(NULL, 'SQL','hard', 90, '2021-01-01 00:00:00')