Mysql 时间差（年、月、天、时、分、秒）
SELECT TIME_TO_SEC(TIMEDIFF('2018-09-30 19:38:45', '2018-08-23 10:13:01')) AS DIFF_SECOND1, -- 秒 UNIX_TIMESTAMP('2018-09-30 19:38:45')-UNIX_TIMESTAMP('2018-08-23 10:13:01') AS DIFF_SECOND2, -- 秒 TIMESTAMPDIFF(SECOND,'2018-08-23 10:13:01','2018-09-30 19:38:45') AS DIFF_SECOND3, -- 秒 TIMESTAMPDIFF(MINUTE,'2018-08-23 10:13:01','2018-09-30 19:38:45') AS DIFF_MINUTE, -- 分 TIMESTAMPDIFF(HOUR,'2018-08-23 10:13:01','2018-09-30 19:38:45') AS DIFF_HOUR, -- 小时 TIMESTAMPDIFF(DAY ,'2018-08-23 10:13:01','2018-09-30 19:38:45') AS DIFF_DATE1, -- 天 DATEDIFF('2018-09-30 19:38:45','2018-08-23 10:13:01') AS DIFF_DATE2, -- 天 TIMESTAMPDIFF(MONTH,'2018-08-23 10:13:01','2018-09-25 19:38:45') AS DIFF_MONTH, -- 月 TIMESTAMPDIFF(YEAR,'2018-08-23 10:13:01','2020-07-25 19:38:45') AS DIFF_YEAR -- 年 FROM DUAL;
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