A primary key is which of the following? An attribute that uniquely identifies each row An attribute that uniquely identifies each column A derived attribute Any attribute 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. Four relations are created. Two relations are created. Three relations are created. TRUE ANSWER : ? YOUR ANSWER : ?
When mapping a multivalued attribute into a relation which of the following is true? Two relations are created. Four relations are created. Three 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? Four relations are created. Three relations are created. Two relations are created. One relation is created. TRUE ANSWER : ? YOUR ANSWER : ?
A relation has which of the following properties? Each row is not unique. Attributes can have the same name within a given table. Each relation has a unique name. The order of the columns is significant. TRUE ANSWER : ? YOUR ANSWER : ?
A synonym is two or more attributes that have different names but the same meaning. True False TRUE ANSWER : ? YOUR ANSWER : ?
The entity integrity rule states that: no primary key may be equal to a value in a foreign key. no primary key attribute may be null. no primary key may be unique. no primary key can be composite. 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 The same thing as a primary key Any attribute TRUE ANSWER : ? YOUR ANSWER : ?
An enterprise key is a primary key whose value is unique for a given relation. True False TRUE ANSWER : ? YOUR ANSWER : ?