I have two tables: bloodtypes and donors bloodtypes: key = number (1 to
8 representing A+,A-,B+,B-,O+,O-,AB+,AB-) donors =Enum List type ref to
bloodtypes table (Example; A+,A-,O+,O-) recepients = Enum List type ref
to bloodtypes table (Example: A+,A...