A relation has which of the following properties?
A. Each row is not unique.
B. Attributes can have the same name within a given table.
C. Each relation has a unique name.
D. The order of the columns is significant.
Answer: Option C
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The entity integrity rule states that:
A. no primary key attribute may be null.
B. no primary key can be composite.
C. no primary key may be unique.
D. no primary key may be equal to a value in a foreign key.
When mapping a many-to-many unary relationship into a relation which of the following is true?
A. One relation is created.
B. Two relations are created.
C. Three relations are created.
D. Four relations are created.
A. First normal form
B. Second normal form
C. Third normal form
D. Fourth normal form
A foreign key is which of the following?
A. Any attribute
B. The same thing as a primary key
C. An attribute that serves as the primary key of another relation
D. An attribute that serves no purpose
Table is synonymous with the term
A collections of application programs built around a central shared database.