DAT 380 Wk 2 - Practice Knowledge Check

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DAT 380 Wk 2 - Practice Knowledge Check

The row's range of permissible values is known as its domain.

•      True
•      False

RDBMSs enforce integrity rules automatically.

•      True
•      False

Character data can contain any character or symbol intended for mathematical manipulation.

•      True
•      False

_____, also known as RESTRICT, yields values for all rows found in a table that satisfy a given condition.

•      UNION
•      DIFFERENCE
•      INTERSECT
•      SELECT

A weak relationship exists if the primary key of the related entity contains at least one primary key component of the parent entity.

•      True
•      False

Only a single attribute, not multiple attributes, can define functional dependence.

•      True
•      False

_____ returns only the attributes requested, in the order in which they are requested.

•      SELECT
•      UNION
•      PROJECT
•      DIFFERENCE

A data dictionary is sometimes described as "the database designer's database" because it records the design decisions about tables and their structures.

•      True
•      False

In the relational model, _____ are important because they are used to ensure that each row in a table is uniquely identifiable.

•      keys
•      relations
•      logical structures
•      indexes

A _____ relationship exists when an association is maintained within a single entity.

•      ternary
•      unary
•      weak
•      strong