database

In a three-level DBMS architecture, the layer that interacts directly with the hardware is the _______ level.

• a. external
• b. conceptual
• c. internal
• d. physical

In a three-level DBMS architecture, the _______ level determines where data is actually stored on the storage devices.

• a. external
• b. conceptual
• c. internal
• d. physical

The _______ level of a three-level DBMS architecture defines the logical view of the data.

• a. external
• b. conceptual
• c. internal
• d. physical

The data model and the schema of a DBMS are often defined at the _______ level.

• a. external
• b. conceptual
• c. internal
• d. physical

In a three-level DBMS architecture, the _______ level interacts directly with the users.

• a. external
• b. conceptual
• c. internal
• d. physical

Of the various database models, the _______ model is the most prevalent today.

• a. hierarchical
• b. network
• c. relational
• d. linked list

Each column in a relation is called _______.

• a. an attribute
• b. a tuple
• c. a union
• d. an attitude

Each row in a relation is called

• a. an attribute
• b. a tuple
• c. a union
• d. an attitude

A unary operator is applied to _______ relation(s) and creates an output of________ relation(s).

• a. one, one
• b. one, two
• c. two, one
• d. two, two

A binary operator is applied to _______ relations (s) and creates an output of ________ relation(s).

• a. one, one
• b. one, two
• c. two, one
• d. two, two