Chapter 2

3. is the end user's view of the data environment.
5. describes and association among entities.
6. an employee may learn many job skills, and each job skill may be learned by many employess.
8. is a brief,precise, and unambiguous description of a policy, procedure, or principle within a specific organization.
9. depicts a set of one-to-many (1:M) relationship between a parent and its children segments. (Each parent can have many children,but each child has only one parent.)

1. level operates at the lowest level of abstraction, describing the way data are saved on storage media such as disks or tapes.
2. is a restriction placed on the data.
3. is database desigh tool. It is easier to examine structures graphically than to describe them in text,database designers prefer to use a graphical tool in which entities and their relationships are pictured.
4. is a characteristic of an entity.
7. is a matrix consisting of a series of row/column intersections.