最近需要删除MySQL数据库中固定时间之前的数据。

需要实现的功能：每天自动删除三天之前的数据行

现有环境：

MYSQL8.0

数据库：changsan

数据表:py_url

具体实现代码为：

CREATE EVENT AutoDeleteOldNotifications

 ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 DAY

ON COMPLETION PRESERVE

  DO

DELETE  FROM changsan.py_url WHERE c_data < DATE_SUB(NOW(), INTERVAL 3 DAY);

参考资料：

http://www.mysqltutorial.org/mysql-triggers/working-mysql-scheduled-event/

http://www.w3school.com.cn/sql/func_datediff.asp

https://stackoverflow.com/questions/32507258/stored-procedure-that-automatically-delete-rows-older-than-7-days-in-mysql

https://stackoverflow.com/questions/9472167/what-is-the-best-way-to-delete-old-rows-from-mysql-on-a-rolling-basis