Counting related records
I'm very new to Filemaker so please bear with me!
I have a table called Contacts and a table called Bookings. These tables are set up with a one to many relationship (one Contact may have many Bookings).
Within the layout for Contact I have added a portal for Bookings and what I'm now having trouble with is added a calculation to count the number of Bookings any one Contact has.
I'm sure this is a simple calculation but would be grateful for any help.