An attribute that must be present for every entity (or relationship) instance is a(n):

________ is used to undo unwanted database changes.

The coding or scrambling of data so that humans cannot read them is called:

In the figure shown below, which of the following business rules would apply? 

An attribute that must be present for every entity (or relationship) instance is a(n):

________ specify computer systems requirements.

What result set is returned from the following query?SELECT Customer_Name, telephone  FROM customers  WHERE city in (‘Boston’,’New York’,’Denver’); 

________ specify computer systems requirements.

The ________ rule specifies that an entity can be a member of only one subtype at a time.

An iterative methodology that rapidly repeats the analysis, design, and implementation phases of the SDLC is called: