Roll up Count of booleans

Question

Is it possible to use a roll up or formula field to count the number of "true" or "false" values on a boolean field of a detail record?

Example:

Account <-Master-----Detail-> My_Object__c

My_Object__c has a boolean (checkbox) field called My_Boolean__c

I want to create a field on Account Object that will tell me how many of the child objects have My_Boolean__c set to false.

Is this possible without creating a trigger or workflow?

Answer 1

As you spotted, this can be done declaratively in one fell swoop!

1. On the Master, create a Roll-up Summary called CountMyBoolean__c with COUNT

2. Under Filter Criteria choose 'records meeting certain criteria' and MyBoolean__c equals True