MODERN DATABASE MGMT.(PEARSON CHANNEL)
13th Edition
ISBN: 9780136709299
Author: Hoffer
Publisher: PEARSON
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Chapter 3, Problem 3.16RQ
In Figure 3-5b, why must the minimum cardinality next to SUPPLIES from PURCHASED PART be one yet the minimum cardinality next to SUPPLIES from SUPPLIER may be zero?
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Let's say we have the attached table :
3. Find the years that company hired more than 5 employees
1) The manager of an international company would like to know the quantity sold for each product and foreach store by day, week, month, and year. For each store, the manager would like to know its correspondingcity and country.You have to design a star schema to achieve the goal of this manager.2) If you think that some of your proposed dimension tables in Q1, are not normalized, you have to convertyour star schema into snowflake schema to normalize these dimension tables.
We have a ternary relationship below:
Job
ID
Employee
Branch
Work
ID
ID
The following rule applies to this system:
One employee only works on one job
One employee only works for one branch
One branch offers many jobs
A job could exist in
many
branches
Many employees are doing same jobs in one branch
Can we decompose the ternary relationship to three binary relationship?
If so, how?
Chapter 3 Solutions
MODERN DATABASE MGMT.(PEARSON CHANNEL)
Ch. 3 - Define each of the following terms: supertype...Ch. 3 - Match the following terms and definitions:...Ch. 3 - Contrast the following terms: supertype; subtype...Ch. 3 - State two conditions that indicate when a database...Ch. 3 - Prob. 3.5RQCh. 3 - Give an example (other than those discussed in the...Ch. 3 - What is the attribute inheritance? Why is it...Ch. 3 - Give an example of each of the following: a...Ch. 3 - What types of business rules are normally captured...Ch. 3 - What is the purpose of a subtype discriminator?
Ch. 3 - Prob. 3.11RQCh. 3 - In what ways is starting a data modeling project...Ch. 3 - Prob. 3.13RQCh. 3 - Prob. 3.14RQCh. 3 - What do you purchase when you acquire a packaged...Ch. 3 - In Figure 3-5b, why must the minimum cardinality...Ch. 3 - When is a member of a supertype always a member of...Ch. 3 - Examine the hierarchy for the university EER...Ch. 3 - Add a subtype discriminator for each of the...Ch. 3 - For simplicity, subtype discriminators were left...Ch. 3 - Refer to the employee EER diagram in Figure 3-2....Ch. 3 - Refer to the EER diagram for patients in Figure...Ch. 3 - Figure 3-13 shows the development Of entity...Ch. 3 - Refer to Problem and Exercise 2-44 in Chapter 2...Ch. 3 - For a library, the entity type HOLDING has four...Ch. 3 - A bank has three types of accounts: checking,...Ch. 3 - Refer to your answer to Problem and Exercise 2-4...Ch. 3 - Refer to your answer to Problem and Exercise 3-24...Ch. 3 - Prob. 3.29PAECh. 3 - Draw an EER diagram for the following situation:...Ch. 3 - Develop an EER model for the following situation,...Ch. 3 - Prob. 3.32PAECh. 3 - Prob. 3.33PAECh. 3 - Prob. 3.34PAECh. 3 - Based on the EER diagram constructed for Problem...Ch. 3 - Prob. 3.36PAECh. 3 - Prob. 3.37PAECh. 3 - Add the following to Figure 3-16: An EMPLOYMENT...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- Let's say we have the attached table : Find the year in which employees hired with minimum salary more than 1000arrow_forwardAn EMPLOYEE has only one JOB_CODE, but a JOB_CODE can be held by many EMPLOYEEs. An EMPLOYEE can participate in many PLANs, and any PLAN can be assigned to many EMPLOYEEs. Note also that the M:N relationship has been broken down into two 1:M relationships for which the BENEFIT table serves as the composite or bridge entity. Question: Create the ERD to show the relationships among EMPLOYEE, BENEFIT, JOB, and PLAN.arrow_forwardDo the tables in figure 1entity exhibit entity integrity? Why or why not?arrow_forward
- An EMPLOYEE has only one JOB_CODE, but a JOB_CODE can be held by many EMPLOYEEs. An EMPLOYEE can participate in many PLANs, and any PLAN can be assigned to many EMPLOYEEs. Note also that the M:N relationship has been broken down into two 1:M relationships for which the BENEFIT table serves as the composite or bridge entity. Question: Create the ERD to show the relationship between EMPLOYEE and JOB.arrow_forwardfor the following entities and relationships: Customer, Order, Product, ProductDepartment. One customer can place many orders One order is placed by only one customer. Customers can buy many products in one order. One product can be purchased by many orders. One product belongs to one ProductDeparment. One productdepartment has many products. what is the maximal cardinality between customer and order? what is the maximal cardinality between product and order? what is the maximal cardinality between product and productDepartment?arrow_forwardWhat is the result of the natural join of the following two tables: Airlines and Fleetarrow_forward
- The following question is based upon the Patient-Treatment relation which records the details of transactions occurring in a medical surgery. You may assume the data are representative. PATIENT ID PATIENT NAME PATIENT DOB CONSULT DATE ITEM NUMBER ITEM DESCRIPTION FEE PROVIDER NUMBER DOCTOR NAME 437 REARDON 4/08/1989 19/7/2020 A012 Standard 56 S55768 Leahy 437 REARDON 4/08/1989 20/7/2020 A012 Standard 56 D42433 Meuller 562 BILSTEIN 12/05/2001 20/7/2020 A013 Short 35 S55768 Leahy 361 WILSON 13/08/1997 20/7/2020 A014 Long 75 S55768 Leahy 895 LEMOS 13/10/1952 20/7/2020 A013 Short 35 D42433 Meuller 895 LEMOS 13/10/1952 20/7/2020 A014 Long 75 D42433 Meuller 678 MORTAL 27/02/1969 20/7/2020 A014 Long 75 S55768 Leahy 432 SOAPIER 1/08/1976 21/7/2020 A012 Standard 56 S55768 Leahy You have been asked to design a…arrow_forwardThe following question is based upon the Patient-Treatment relation which records the details of transactions occurring in a medical surgery. You may assume the data are representative. PATIENT ID PATIENT NAME PATIENT DOB CONSULT DATE ITEM NUMBER ITEM DESCRIPTION FEE PROVIDER NUMBER DOCTOR NAME 437 REARDON 4/08/1989 19/7/2020 A012 Standard 56 S55768 Scott 437 REARDON 4/08/1989 20/7/2020 A012 Standard 56 D42433 Mueller 562 BILSTEIN 12/05/2001 20/7/2020 A013 Short 35 S55768 Scott 361 WILSON 13/08/1997 20/7/2020 A014 Long 75 S55768 Scott 895 LEMOS 13/10/1952 20/7/2020 A013 Short 35 D42433 Mueller 895 LEMOS 13/10/1952 20/7/2020 A014 Long 75 D42433 Mueller 678 MORT 27/02/1969 20/7/2020 A014 Long 75 S55768 Scott 432 SOAPIER 1/08/1976 21/7/2020 A012 Standard 56 S55768 Scott You have been asked to design a…arrow_forwardWhat is minimum cardinality?arrow_forward
- Use the ER Dlagram shown on Figure 1 to answer question 9: 9. According to the ER diagram on Figure 1, which of the following is true? A) For each employee, we will keep track of either the employee name or the unique employee ID. B) For each department, we will keep track of either the unique department ID or the department location. C) Each employee reports to exactly one department. A department may have many employees reporting to it, but it does not have to have any. D) None of the above. Answer: EmpID EmpName EMPLOYEE Reports To Figure 1 DeptID DEPARTMENT DeptLocationarrow_forwardUse the following diagram relation to perform the normalization. You need to provide the 2NF and 3NF.arrow_forwardConsider the following tables containing sales information: Location Sales LociD City LociD PeriD TimID Amnt Time Well 230 TimID Day Nels 300 Mon Auck 310 Tue Wed SalesPerson 50 Thu PerID Name 550 3 100 Fri John 5 Sut Susan 4 880 ア San James Mon Susan 60 Ann 140 Use Cross tabulation to explore and reveal the relationship between: | i) Location and Time ii) Personnel and Timearrow_forward
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