Logical Database Design When mapping a many-to-many unary relationship into a relation which of the following is true? Four relations are created. One relation is created. Two relations are created. Three relations are created. Four relations are created. One relation is created. Two relations are created. Three relations are created. ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design If no multivalued attributes exist in a relation, then the relation is in what normal form? Third normal form Fourth normal form First normal form Second normal form Third normal form Fourth normal form First normal form Second normal form ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design When mapping a supertype/subtype relationship which of the following is true? 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. 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. The supertype primary key is assigned to each subtype. ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design If a relation is in third normal form, it does not need to be in second normal form. True False True False ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design Weak entities do not get mapped into a relation. True False True False ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design A foreign key may be null and still adhere to the referential integrity constraint. False True False True ANSWER DOWNLOAD EXAMIANS APP
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