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MySQL time processing
2022-07-06 04:54:00 【Data analysis of financial Xiaobai】
SELECT DAY(date) as day_id,COUNT(*) FROM question_practice_detail
WHERE MONTH(date)=8 and YEAR(date)=2021
GROUP BY day_id
# insert data
INSERT INTO exam_record(uid, exam_id, start_time, submit_time,score)
values
(1001,9001,'2021-09-01 22:11:12','2021-09-01 23:01:12',90),
(1002,9002,'2021-09-04 07:01:02',null,null);
# insert data
INSERT INTO exam_record_before_2021
SELECT NULL,uid, exam_id, start_time, submit_time, score
FROM exam_record
WHERE submit_time < '2021-01-01 00:00:00';
replace into examination_info
(id,exam_id,tag,difficulty,duration,release_time)
values(null,9003,'SQL','hard',90,'2021-01-01 00:00:00')
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