The primary key in a relation does not need to be underlined. False True TRUE ANSWER : ? YOUR ANSWER : ?
A relation has which of the following properties? Attributes can have the same name within a given table. The order of the columns is significant. Each relation has a unique name. Each row is not unique. TRUE ANSWER : ? YOUR ANSWER : ?
A primary key is which of the following? An attribute that uniquely identifies each column A derived attribute An attribute that uniquely identifies each row Any attribute TRUE ANSWER : ? YOUR ANSWER : ?
A composite attribute does not get mapped into a relation. 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. The subtype primary key is assigned to each supertype. There is no primary key/foreign key relationship between a supertype/subtype. There is no link between the supertype/subtype entities. 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 First normal form Third normal form TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a binary many-to-many relationship 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 : ?
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 : ?