Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 5, Problem 9C
Explanation of Solution
Crow’s Foot ER diagrams for support the need of business:
The following data model shows the solution for the given question.
Explanation:
- In the above data model, the “Person” supertype entity contains “Per_No” as primary key. It contain optional “Author” entity and this entity contain “Per_No” is the primary and foreign key.
- The person has much expertise to work on the particular research and the “Expertise” has “Per_No” and “Int_code” are the primary and foreign keys.
- The “Interest” entity contains “Int_code” as primary key...
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• Identify the relationship between Entities (clearly showing the cardinality and participation)
The question is very clear slove it according to it
Create an Entity/Relationship (ER) diagram to model the following scenario:
An online magazine maintains a list that ranks restaurants based on reviews sent by the magazine's subscribers
each restaurant is uniquely identified by an auto-generated code
other attributes associated with a restaurant include its name, address, price range (1-3), rating (1-5 stars), and cuisine type
there are many cuisine types and more can be added in the future
subscribers are uniquely identified by their email and each have a name
subscribers can review as many restaurants as they want, and a restaurant can be reviewed by many subscribers
a review has a rating (1-5 stars), a date, and comments
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once a new review…
ABC is a pharmaceutical company that recruits volunteers for clinical trials on drugscurrently under development at the company. The company conducts multipleclinical trials concurrently. Each clinical trial is assigned a trial code together with description of theclinical trial, start date, end date, and the lead scientist. Each clinical trialinvolves at least one treatment, and each treatment belongs to only one trial.Treatment has its conduct date. When volunteers sign up for a treatment of a clinical trial, their contact detailsincluding full name, address, contact number, email address, as well as theirunique volunteer number are recorded. Each volunteer is involved in at leastone treatment, while each treatment is tested on at least 30 volunteers. In addition, medical details for each volunteer including weight, height, bloodtype, race, gender, and medical condition are also recorded separately. At each treatment each volunteer involves a specific drug of certain type,…
Chapter 5 Solutions
Database Systems: Design, Implementation, & Management
Ch. 5 - Prob. 1RQCh. 5 - What kinds of data would you store in an entity...Ch. 5 - Prob. 3RQCh. 5 - What is a subtype discriminator? Give an example...Ch. 5 - Prob. 5RQCh. 5 - What is the difference between partial...Ch. 5 - Prob. 7RQCh. 5 - According to the data model, is it required that...Ch. 5 - Prob. 9RQCh. 5 - Prob. 10RQ
Ch. 5 - Prob. 11RQCh. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - When implementing a 1:1 relationship, where should...Ch. 5 - What is time-variant data, and how would you deal...Ch. 5 - Prob. 16RQCh. 5 - Prob. 1PCh. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 8CCh. 5 - Prob. 9CCh. 5 - Prob. 10C
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