How to determine Campaign click-through from data feed

[GabrielaNa1]

Hi, I am trying to figure out the calculation of metric called: Campaign click-through from the data feed. In AA it says: This is an Adobe provided component.

So, how do I calculate this one from data feed?
Tanks.

[GabrielaNa1]

I think I figured this out:

(post_event_list like '20,%' or post_event_list like '%,20,%' or post_event_list like '%,20' )