Fufill ONLY with ''False''

Question

Hi!

 

I need to understand one logic.

I have one database with two columns (Name and Absent) + one button.

What I need to do?

When I click one button its should this:

if you find in  the ''Absent'' column, blank spaces (or blank cells). Fufill it ONLY with the word ''false''.

 

Name	Absent
Chairman	True
Chairman

 

Ruben	........
Shuman	True
Andrew	........

 

Then please anyone can help?