Bundle: Database Systems Design, Implementation, & Management, Loose-leaf Version, 13th + MindTapV2.0, 1 term Printed Access Card
13th Edition
ISBN: 9780357475188
Author: Coronel, Carlos, Morris, Steven
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 5, Problem 12RQ
Program Plan Intro
Primary key (PK):
- To identify each record in a table, at least there must be one data field, which should be unique.
- That is corresponding data field of every record should be unique.
- It is called primary key.
- Primary key is used to identify the unique record from a collection of records.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
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?
Create a “level of attributes” diagram for a car rental. Include its core benefit, expected attributes, and add-on attributes. Have any of these attributes changed over the past 10 years? Please explain your answer.
Our criteria must be broad and consistent to have any value.
Chapter 5 Solutions
Bundle: Database Systems Design, Implementation, & Management, Loose-leaf Version, 13th + MindTapV2.0, 1 term Printed Access Card
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 a disjoint subtype? Give an example.Ch. 5 - What is the difference between partial...Ch. 5 - Prob. 8RQCh. 5 - According to the data model, is it required that...Ch. 5 - Prob. 10RQ
Ch. 5 - Prob. 11RQCh. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - Prob. 14RQCh. 5 - When implementing a 1:1 relationship, where should...Ch. 5 - What is time-variant data, and how would you deal...Ch. 5 - Prob. 17RQCh. 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
Knowledge Booster
Learn more about
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
- Explain the benefits and drawbacks of each model, as well as the step(s) that you believe should be added or removed in order to make each model more effective.arrow_forwardExplain the advantages and disadvantages of each model, as well as the step(s) that you feel should be added or deleted to improve the effectiveness of each model.arrow_forwardBriefly explain change models.arrow_forward
- What are the deficiencies to using group policyarrow_forwardUsing 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?arrow_forwardIf one characteristic may have several values, how does it differ from a recurring group?arrow_forward
- Please describe what an entity-relationship model is as well as how it operates.arrow_forwardwhat is competence atlas according to Erpenbeck and Heyse?arrow_forwardWhat issues may emerge as a result of vertical partitioning of a relationship, as well as the general circumstances that can influence them, are discussed.arrow_forward
- What exactly is meant to be accomplished by using an Entity-Relationship Model, and how is this model used?arrow_forwardCreate the physical level ERD. I believe my physical level ERD is missing several parts. However, the assignement didn't give many business constraints, if any. Namely, that (from a table list.)(I have used many of my questions around these exercises, due to a lot of confusion and lack of confidence in my work) a company wants to keep track of employee assignment to company projects. I, suppose, I just want to make sure that I am creating a physical level ERD.... The picture attatched is my work. What makes me nervous, is that my diagram doesn't look much different then my logical level ERD.arrow_forwardUse the ER Diagram 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 DeptLocation DEPARTMENTarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill Education
Starting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSON
Digital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSON
Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage Learning
Programmable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education