Logical Database Design The entity integrity rule states that: no primary key may be unique. no primary key attribute may be null. no primary key may be equal to a value in a foreign key. no primary key can be composite. no primary key may be unique. no primary key attribute may be null. no primary key may be equal to a value in a foreign key. no primary key can be composite. ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design When mapping a multivalued attribute into a relation which of the following is true? Three relations are created. 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. ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design An enterprise key is a primary key whose value is unique for a given relation. False True False True ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design The relational model consists of: data in the form of tables. unorganized data. data redundancy. operations using non-SQL languages. data in the form of tables. unorganized data. data redundancy. operations using non-SQL languages. 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
Logical Database Design A foreign key is which of the following? An attribute that serves no purpose An attribute that serves as the primary key of another relation Any attribute The same thing as a primary key An attribute that serves no purpose An attribute that serves as the primary key of another relation Any attribute The same thing as a primary key ANSWER DOWNLOAD EXAMIANS APP
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