The primary key of the new relation in a many-to-many relationship is a composite key comprised of the primary keys of each of the binary entities. True False TRUE ANSWER : ? YOUR ANSWER : ?
A synonym is two or more attributes that have different names but the same meaning. False True TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a regular entity into a relation which of the following is true? Two relations are created. One relation is created. Four relations are created. Three relations are created. TRUE ANSWER : ? YOUR ANSWER : ?
If a relation is in third normal form, it does not need to be in second normal form. False True TRUE ANSWER : ? YOUR ANSWER : ?
A transitive dependency is which of the following? A functional dependency between two or more key attributes. A relation that is in second normal form. A functional dependency between two or more nonkey attributes. A relation that is in first normal form. TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a many-to-many unary relationship into a relation which of the following is true? Four relations are created. Three relations are created. One relation is created. Two relations are created. TRUE ANSWER : ? YOUR ANSWER : ?
A foreign key may be null and still adhere to the referential integrity constraint. True False TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a supertype/subtype relationship which of the following is true? The supertype primary key is assigned to each subtype. There is no primary key/foreign key relationship between a supertype/subtype. The subtype primary key is assigned to each supertype. There is no link between the supertype/subtype entities. TRUE ANSWER : ? YOUR ANSWER : ?