Method ADT.Relation.Binary()->`-()
- Method `-
mixedres =ADT.Relation.Binary()-rel- Description
The expression `rel1 - rel2' returns a new relation which has those and only those relation entries that are present in rel1 and not present in rel2.
mixed res = ADT.Relation.Binary() - rel
The expression `rel1 - rel2' returns a new relation which has those and only those relation entries that are present in rel1 and not present in rel2.