Logical Database Design A null value is assigned when no other value applies. True False True False ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design 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. 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. ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design A primary key is which of the following? An attribute that uniquely identifies each row Any attribute A derived attribute An attribute that uniquely identifies each column An attribute that uniquely identifies each row Any attribute A derived attribute An attribute that uniquely identifies each column ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design A relation has which of the following properties? The order of the columns is significant. 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. Each row is not unique. Attributes can have the same name within a given table. Each relation has a unique name. ANSWER DOWNLOAD EXAMIANS APP
Logical Database Design When mapping a regular entity into a relation which of the following is true? One relation is created. Three relations are created. Two relations are created. Four relations are created. One relation is created. Three relations are created. Two relations are created. Four relations are created. 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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