It525 Assignment 2

1197 words - 5 pages

Database Design and Data Modeling: Assignment 2

Mohammed Azrak

Kaplan University

Database Design and Data Modeling: Assignment 2

Question #1 Definitions:

Define each of the following terms (1 pt. each). In addition, provide an example of each term (2 pts. each).
a. Business Rule
b. Entity
c. Entity Set (Entity Type)
d. Entity Instance
e. Attribute
f. Relationship
g. Connectivity
h. Cardinality Constraint
i. Participation Constraint.
j. Associative Entity

Answer #1:

a. Business Rule – a description of a policy, procedure or principle within an ...view middle of the document...

For example, an employee works for one or many departments.

i. Participation Constraint - is when a certain relation can only have at a maximum of one instance for a relationship. For example, an employee does not work for a department or at most only one department.

j. Associative Entity – is an element of the ER model also called resolving entities to resolve issues with many to many relationships. For example a student registers a course and many students registers many course where “register” is the associative entity.

(Coronel, Rob, & Morris, 2012).

Question #2 Explanation of each row in the 4-row format:

Please use this four-row format when writing your connectivity-determining business rules.
Figure 1. Publisher Database
[pic]
Explanation of each row in the 4-row format:
(1) Write the entity pair. Underline and/or bold.
(2) Give one business rule. Indicate the multiplicity of that rule in parentheses.
(3) Give the other business rule. Indicate the multiplicity of that rule in parentheses.
(4) Give the connectivity. (If the connectivity is M:N, give the associative entity name.)
Following is an example of the required four-row format for business rules for a binary relationship for this Assignment.
Publisher – Book
ONE Publisher may publish MANY Books [M]
ONE Book has ONE Publisher [1]
Publisher 1:M Book.
Complete the same 4-row format for the remaining relationships in the ERD illustrated in Figure 1.
The Unit 2 Enrichment Seminar will have more information about writing these rules and for determining, in a one-to-many relationship, which is the "1" entity type and which is the "M" entity type.
Be sure the connectivity row for each 1:M relationship has the correct direction. The rule with the multiplicity "many" will determine the direction. For example, if the rule is: "ONE Publisher may publish MANY Books", then Publisher is the "1" table and Book is the "M" table, so you would write the connectivity as: Publisher 1:M Books.
Use the four-row format to write the business rules and connectivity for the three binary relationships other than Publisher – Book.

Answer #2:

1) Author – Book
2) MANY Authors may write MANY Books [N]
3) MANY Books has been written by MANY Authors [M]
4) Author M:N Book. Requires associative entity: AuthorBookWrite
1) Country - Author

2) ONE Country has MANY Authors [M]

3) ONE Author is a citizen of ONE country [1]

4) Country 1:M Author

1) Book - Volume

2) ONE Book has MANY Volumes [M]

3) ONE Volume may have ONE Book [1]

4) Book 1:M Volume

Question #3 Primary Key / Foreign Key Placement:

The primary key of a table is often named after the table. Example: ISBN-13 would be chosen as the name of the primary key for the Book table. For each entity set in the table below, give the primary key attribute(s) and the foreign key attribute(s) (if any).
...

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