Logical Database Design

Q1: 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.

Q2: 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.

Q3: 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.

Q4: When mapping a multivalued attribute 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.

Q5: When mapping a supertype/subtype relationship which of the following is true?

A The supertype primary key is assigned to each subtype.

B The subtype primary key is assigned to each supertype.

C There is no link between the supertype/subtype entities.

D There is no primary key/foreign key relationship between a supertype/subtype.

Q6: Relations are:

A two-dimensional tables.

B three-dimensional tables.

C four-dimensional tables.

D five-dimensional tables.

Q7: A transitive dependency is which of the following?

A A functional dependency between two or more key attributes.

B A functional dependency between two or more nonkey attributes.

C A relation that is in first normal form.

D A relation that is in second normal form.

Q8: When mapping a regular entity 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.

Q9: When mapping a ternary relationship with an associative entity 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.

Q10: The relational model consists of:

A data in the form of tables.

B data redundancy.

C operations using non-SQL languages.

D unorganized data.

Q11: If no multivalued attributes exist in a relation, then the relation is in what normal form?

A First normal form

B Second normal form

C Third normal form

D Fourth normal form

Q12: A primary key is which of the following?

A Any attribute

B An attribute that uniquely identifies each row

C An attribute that uniquely identifies each column

D A derived attribute

Q13: When mapping a binary many-to-many 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.

Q14: 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

Q15: If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?

A First normal form

B Second normal form

C Third normal form

D Fourth normal form


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