Data Models

Question 1

Data modeling

Answer 1

The process of creating a specific data model for a determined problem domain.

Question 2

Data model

Answer 2

A representation, usually graphic, of a complex “real-world” data structure

Data models are used in the database design phase of database life cycle.

Question 3

The importance of data models

Answer 3

Data models can facilitate interaction among the designer, the applications progammer, and the end user.

Question 4

entity

Answer 4

A person, place, thing, concept, or event for which data can be stored.

Question 5

attribute

Answer 5

A characteristic of an entity or object.

an attribute has a name and a data type.

Question 6

relationship

Answer 6

An association between entities.

Question 7

One-to-many(1:M) relationship

Answer 7

Associations among two or more entites that are used by data

In a 1:M relationship, one entity instance is associated with many instances of the related entity

Question 8

many-to-many relationship(M:N)

Answer 8

Association among two or more entities in which one occurrence of an entity is associated with many occurrences of a related entity is associated with many occurences of the first entity

Question 9

one-to-one(1:1) relationship

Answer 9

In a 1:1 relationship, one entity instance is associated with only one instance of the related entity