Logical Database Design The entity integrity rule states that: no primary key attribute may be null. no primary key can be composite. no primary key may be equal to a value in a foreign key. no primary key may be unique. no primary key attribute may be null. no primary key can be composite. no primary key may be equal to a value in a foreign key. no primary key may be unique. ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design When mapping a many-to-many unary relationship 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. Three relations are created. Two relations are created. One relation is created. Four relations are created. ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form? Third normal form Second normal form First normal form Fourth normal form Third normal form Second normal form First normal form Fourth normal form ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design A foreign key is which of the following? The same thing as a primary key 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 An attribute that serves as the primary key of another relation An attribute that serves no purpose Any attribute ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design A transitive dependency is which of the following? A functional dependency between two or more key attributes. A functional dependency between two or more nonkey attributes. A relation that is in second normal form. A relation that is in first normal form. A functional dependency between two or more key attributes. A functional dependency between two or more nonkey attributes. A relation that is in second normal form. A relation that is in first normal form. ANSWER DOWNLOAD EXAMIANS APP
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