Roll-up Summary : Roll-up Summary is also a read-only field type. By using this Roll-up Summary data types we are able to make some mathematical calculations like Sum, Minimum, Maximum values of a afield in a related list or the record count of all records listed in a related list.
Roll-up Summary is also a read-only field type. By using this Roll-up Summary data types we are able to make some mathematical calculations like Sum, Minimum, Maximum values of a afield in a related list or the record count of all records listed in a related list.