A primary key is which of the following? An attribute that uniquely identifies each column Any attribute An attribute that uniquely identifies each row A derived attribute TRUE ANSWER : ? YOUR ANSWER : ?
The primary key in a relation does not need to be underlined. False True 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 : ?
If no multivalued attributes exist in a relation, then the relation is in what normal form? First normal form Fourth normal form Third normal form Second normal form TRUE ANSWER : ? YOUR ANSWER : ?
A relation has which of the following properties? Each row is not unique. Each relation has a unique name. Attributes can have the same name within a given table. The order of the columns is significant. 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 : ?
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. Two relations are created. One relation is created. TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a regular entity into a relation which of the following is true? Three relations are created. Two relations are created. One relation is created. Four relations are 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? Second normal form Third normal form Fourth normal form First normal form TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a ternary relationship with an associative entity into a relation which of the following is true? One relation is created. Two relations are created. Four relations are created. Three relations are created. TRUE ANSWER : ? YOUR ANSWER : ?