Long polling - Message system

Question

I\'m looking into doing some long polling with jQuery and PHP for a message system. I\'m curious to know the best/most efficient way to achieve this. I\'m basing is off this Sim

Answer 1

Instead of adding new column as last_checked you can add as last_checked_time. So that you can get the data from last_checked_time to the current_time.

(i.e) DATA BETWEEN  `last_checked_time` AND `current_time`