Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Chapter 2, Problem 2.38PAE
Review Figure 2-8LQ and Figure 2-22.
- Identify any attributes in Figure 2-22 that might be composite attributes but are not shown that way. Justify your suggestions. Redraw the ERD to reflect any changes you suggest.
- Identify any attributes in Figure 2-22 that might be multivalued attributes but are not shown that way. Justify your suggestions. Redraw the ERD to reflect any changes you suggest.
- Is it possible for the same attribute to be both composite and multivalued? If no, justify your answer; if yes, give an example. (Hint: Consider the CUSTOMER attributes in Figure 2-22.)
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Using the ERD diagram above, identify an attribute that might represent a Composite Attribute. Once you identify, explain why this is so. Is this the only attribute? Are there others?
Using the ERD diagram above, identify an attribute that might represent a Derived Attribute. Once you identify, explain why this is so. Is this the only attribute? Are there others?
Illustrate an Entity-Relationship Diagram (ERD) model using Crow’s Foot notation
Here we can have the following entities
1.patients:this entity will store the details of the patients and the attributes for this entity is
id(which is unique for each patient and can be used as a primary key)
name(this attribute will store the name of the patient and it is a composite attribute)
address(this attribute will store the address of the patient and it is multi valued attribute. )
contact_num(this is also a multi valued attribute which will store the contact details of the patient).
age(which is a derived attribute)
2.room:this entity will store the information about the details of the rooms. The attributes are.
id(this is unique for each room and can be used as a primary key)
room number(this will store the room number)
Total_bed(this will store the total number of beds present in that room)
3. Bed:this entity will store the information regarding to each bed present in an room, and the…
Chapter 2 Solutions
Modern Database Management
Ch. 2 - Define each of the following terms: entity type...Ch. 2 - Match the following terms and definitions....Ch. 2 - Contrast the following terms: stored attribute;...Ch. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - State six general guidelines for naming data...Ch. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - State three conditions that suggest the designer...
Ch. 2 - List the four types of cardinality constraints,...Ch. 2 - Give an example, Other than those described in...Ch. 2 - What is the degree of a relationship? List the...Ch. 2 - Give an example (Other than those described in...Ch. 2 - Give an example of each of the following, other...Ch. 2 - Give an example of the use of effective (or...Ch. 2 - State a rule that says when to extract an...Ch. 2 - Prob. 2.18RQCh. 2 - In addition to explaining what action is being...Ch. 2 - For the Manages relationship in Figure 2-12a,...Ch. 2 - Explain the distinction between entity type and...Ch. 2 - Why is it recommended that every ternary...Ch. 2 - A cellular operator needs a database to keep track...Ch. 2 - Prob. 2.24PAECh. 2 - Answer the following questions concerning Figure...Ch. 2 - Prob. 2.26PAECh. 2 - You may have been assigned a CASE or a drawing...Ch. 2 - Consider the two E-R diagrams in Figure 2-25 Q,...Ch. 2 - Prob. 2.29PAECh. 2 - Are associative entities also weak entities? Why...Ch. 2 - Because Visio does not explicitly show associative...Ch. 2 - Figure 2-26 shows a grade report that is mailed to...Ch. 2 - Prob. 2.33PAECh. 2 - The Is Married To relationship in Figure 2-12a...Ch. 2 - Figure 2-27 represents a situation of students who...Ch. 2 - Figure 2-28 shows two diagrams (A and B), both of...Ch. 2 - Prob. 2.37PAECh. 2 - Review Figure 2-8LQ and Figure 2-22. Identify any...Ch. 2 - Prob. 2.39PAECh. 2 - Prob. 2.40PAECh. 2 - Prob. 2.41PAECh. 2 - Prob. 2.42PAECh. 2 - Prob. 2.43PAECh. 2 - Prob. 2.44PAECh. 2 - Prob. 2.45PAECh. 2 - Prob. 2.46PAECh. 2 - Prob. 2.47PAECh. 2 - Prob. 2.48PAECh. 2 - Draw an ERD for the following situation. (State...Ch. 2 - Prob. 2.50PAECh. 2 - Prob. 2.51PAECh. 2 - Review your answer to Problem and Exercise 2-49 if...
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