Logical Database Design A primary key may be null. False True False True ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design A null value is assigned when no other value applies. True False True False ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design When mapping a supertype/subtype relationship which of the following is true? The supertype primary key is assigned to each subtype. There is no primary key/foreign key relationship between a supertype/subtype. There is no link between the supertype/subtype entities. The subtype primary key is assigned to each supertype. The supertype primary key is assigned to each subtype. There is no primary key/foreign key relationship between a supertype/subtype. There is no link between the supertype/subtype entities. The subtype primary key is assigned to each supertype. ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design The entity integrity rule states that: no primary key attribute may be null. no primary key may be unique. no primary key can be composite. 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. no primary key may be equal to a value in a foreign key. 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 When mapping a multivalued attribute into a relation which of the following is true? 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. Four relations are created. ANSWER DOWNLOAD EXAMIANS APP
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