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DAT 380 Wk 2 - Practice Knowledge Check

DAT 380 Wk 2 - Practice Knowledge Check PLDZ-12788
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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
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