Show datediff as seconds, milliseconds

Question

I\'m trying to calculate the difference between two datetime values.

I tried datediff(s, begin,end) and datediff(ms, begin,end) however I w

Answer 1

DATEDIFF takes only two arguments in MySQL. This works for me:

TIMESTAMPDIFF(SECOND, NOW(), '2019-09-09 18:52:00')