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Hi there,  Please see the attached document below and I am looking for Question 4 only. Please refer the attached document to answer the question.  Thanks for your quick response in Adance as usuall. please find the attached question below. Best

Hi there,  Please see the attached document below and I am looking for Question 4 only. Please refer the attached document to answer the question.  Thanks for your quick response in Adance as usuall. please find the attached question below. Best

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Hi there, 

Please see the attached document below and I am looking for Question 4 only. Please refer the attached document to answer the question. 

Thanks for your quick response in Adance as usuall. please find the attached question below.

Best

6. Strong Entity and Weak Entity • Strong Entity Set: If an entity set has a primary key then it is a strong entity set. • Wak Entity Set: If an entity set has no key, i.e. we cannot identify uniquely an entity member, then it is a weak entity set. • Example: SSN E_NAME YRS_EMPLOYED The Dominator (owner) must be on "one" side Employee A double outlined box indicates a weak entity SUPPORTS Dependent Total Participation is required D_NAME D AGE Figure 3 Strong entity and Weak entity The dominating entity set is usually a strong entity set. The relationship between a weak entity set and the dominator must be "many-to-one". If it is "one-to-one" every attributes of the weak entity set will be placed in the dominator as its attributes and the weak entity can be safely eliminated. The weak entity set has
Transcribed Image Text:6. Strong Entity and Weak Entity • Strong Entity Set: If an entity set has a primary key then it is a strong entity set. • Wak Entity Set: If an entity set has no key, i.e. we cannot identify uniquely an entity member, then it is a weak entity set. • Example: SSN E_NAME YRS_EMPLOYED The Dominator (owner) must be on "one" side Employee A double outlined box indicates a weak entity SUPPORTS Dependent Total Participation is required D_NAME D AGE Figure 3 Strong entity and Weak entity The dominating entity set is usually a strong entity set. The relationship between a weak entity set and the dominator must be "many-to-one". If it is "one-to-one" every attributes of the weak entity set will be placed in the dominator as its attributes and the weak entity can be safely eliminated. The weak entity set has
Read the Introduction, ER, Crow's Feet, Relational Model Lecture Notes and study Database Fundamentals (Book Chapter) Figure 13.12 → Figure 13.13 example (ignore the normalization process for now). All materials are posted on the Course Content page on Blackboard. Homework #1 Convert the following ER diagrams to Relational Schema (express the schema in a format as shown in Figure 13.13 example given in the Book Chapter - Database Fundamentals) – Note, you can rename attributes when there are name conflicts (i.e., whenever you find that in a table there are attributes that have the same name, you must change their names so that each attribute has a distinct name in the table). Q1. A Q2. A E E Bi B Q3. For this conversion, you are not allowed to create a separate table for relationship 'S': D A F E R E B Q4. Figure 3 in Lecture Note: ER Model OHO
Transcribed Image Text:Read the Introduction, ER, Crow's Feet, Relational Model Lecture Notes and study Database Fundamentals (Book Chapter) Figure 13.12 → Figure 13.13 example (ignore the normalization process for now). All materials are posted on the Course Content page on Blackboard. Homework #1 Convert the following ER diagrams to Relational Schema (express the schema in a format as shown in Figure 13.13 example given in the Book Chapter - Database Fundamentals) – Note, you can rename attributes when there are name conflicts (i.e., whenever you find that in a table there are attributes that have the same name, you must change their names so that each attribute has a distinct name in the table). Q1. A Q2. A E E Bi B Q3. For this conversion, you are not allowed to create a separate table for relationship 'S': D A F E R E B Q4. Figure 3 in Lecture Note: ER Model OHO
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