The cardinality of the number of rows in the relation. The number in C ranges from the number in A times the number in B all the way to 0. The cardinality of the number of rows in the relation. The number in C ranges from the number in A times the number in B all the way to 0. The arity is the number of columns in the relation. In relational algebra, all columns of the relations are kept, and thus the arity of C is the arity of A plus B. The arity of both A and B must be greater than one. The arity is the number of columns in the relation. In relational algebra, all columns of the relations are kept, and thus the arity of C is the arity of A plus B. The arity of both A and B must be greater than one. The cardinality of the number of rows in the relation. The number in C ranges from the number in A times the number in B all the way to 0. The arity is the number of columns in the relation. In relational algebra, all columns of the relations are kept, and thus the arity of C is the arity of A plus B. The arity of both A and B must be greater than one. Relation C is the join of relation A and relation B on condition p. Which of the following statements must be true in all cases?

