A primary key is which of the following? A derived attribute An attribute that uniquely identifies each row An attribute that uniquely identifies each column Any attribute TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a multivalued attribute into a relation which of the following is true? Two relations are created. Three relations are created. Four relations are created. One relation is created. TRUE ANSWER : ? YOUR ANSWER : ?
If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form? Fourth normal form Second normal form Third normal form First normal form TRUE ANSWER : ? YOUR ANSWER : ?
A foreign key is which of the following? An attribute that serves as the primary key of another relation An attribute that serves no purpose Any attribute The same thing as a primary key TRUE ANSWER : ? YOUR ANSWER : ?
The primary key in a relation does not need to be underlined. True False TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a binary many-to-many relationship into a relation which of the following is true? Three relations are created. Four relations are created. Two relations are created. One relation is created. TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a supertype/subtype relationship which of the following is true? There is no link between the supertype/subtype entities. The supertype primary key is assigned to each subtype. The subtype primary key is assigned to each supertype. There is no primary key/foreign key relationship between a supertype/subtype. TRUE ANSWER : ? YOUR ANSWER : ?
A transitive dependency is which of the following? A functional dependency between two or more nonkey attributes. A functional dependency between two or more key attributes. A relation that is in second normal form. A relation that is in first normal form. TRUE ANSWER : ? YOUR ANSWER : ?
A composite attribute does not get mapped into a relation. True False TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a ternary relationship with an associative entity into a relation which of the following is true? Two relations are created. One relation is created. Three relations are created. Four relations are created. TRUE ANSWER : ? YOUR ANSWER : ?