Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Expert Solution & Answer
Chapter 4, Problem 13RQ
Explanation of Solution
Composite entity:
A composite entity is normally used to convert M: N relationships into 1: M relationships. It is also referred as “bridge entity”, which has a primary key (PK) composed of multiple attributes.
- The PK attributes are inherited from the entities, which it associates to one another.
Usage of composite entity in ERD:
In the Entity Relationship Management (ERM), an M: N relationship is effective at the conceptual level. But when implementing the ERM in a relational
Example:
Consider the entities CLASS and STUDENT with M: N relationship defined by following business rules:
- A student can take several classes...
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Chapter 4 Solutions
Database Systems: Design, Implementation, & Management
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - Prob. 11RQCh. 4 - Discuss two ways in which the 1:M relationship...
Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11C
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- EX:[AE00]=fa50h number of ones =1111 1010 0101 0000 Physical address=4AE00h=4000h*10h+AE00h Mov ax,4000 Mov ds,ax; DS=4000h mov ds,4000 X Mov ax,[AE00] ; ax=[ae00]=FA50h Mov cx,10; 16 bit in decimal Mov bl,0 *: Ror ax,1 Jnc ** Inc bl **:Dec cx Jnz * ;LSB⇒CF Cf=1 ; it jump when CF=0, will not jump when CF=1 HW1: rewrite the above example use another wayarrow_forwardEX2: Write a piece of assembly code that can count the number of ones in word stored at 4AE00harrow_forwardWrite a program that simulates a Magic 8 Ball, which is a fortune-telling toy that displays a random response to a yes or no question. In the student sample programs for this book, you will find a text file named 8_ball_responses.txt. The file contains 12 responses, such as “I don’t think so”, “Yes, of course!”, “I’m not sure”, and so forth. The program should read the responses from the file into a list. It should prompt the user to ask a question, then display one of the responses, randomly selected from the list. The program should repeat until the user is ready to quit. Contents of 8_ball_responses.txt: Yes, of course! Without a doubt, yes. You can count on it. For sure! Ask me later. I'm not sure. I can't tell you right now. I'll tell you after my nap. No way! I don't think so. Without a doubt, no. The answer is clearly NO. (You can access the Computer Science Portal at www.pearsonhighered.com/gaddis.)arrow_forward
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