MySQL trigger: Update when reaching a certain datetime

Question

I want to create a MySQL trigger that updates a table everytime one of the datetime rows in a different table reaches a datetime lower than now.

How would I

Answer 1

You could use MySQL's Event Scheduler.

Answer 2

You should be able to do it using a trigger and the event scheduler:
- create a trigger on the table that is fired on every update / insert
- this trigger creates a scheduled event that occurs at the datetime of the row and updates your second table