True/False Questions

In the Relational Data Model, Referential Integrity Constraint is a special kind/case of Foreign Key Constraint. Multiple Inheritance happens when a class has more than one sub-class. This problem can be observed in Programming Languages as well. Given two relations named A and B, if we 8-JOIN A and B, the maximum number of attributes in the result relation could be the number of attributes of A) times(*) the number of attributes of B). in an SQL SELECT statement means "all the tuples". In relational algebra, Cartesian Product (x) can be implemented using the 6-JOIN operator. Cartesian Product ISA -JOIN where 6-condition always evaluates to true. SQL is based on Predicate Calculus. A query in SQL always specifies what should be included in the query result