REPLACE INTO examination_info (exam_id, tag, difficulty, duration, release_time) VALUES (9003, 'SQL', 'hard', 90, '2021-01-01 00:00:00');
REPLACE INTO examination_info (exam_id, tag, difficulty, duration, release_time) VALUES (9003, 'SQL', 'hard', 90, '2021-01-01 00:00:00');