Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 5, Problem 11RQ
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.
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Chapter 5 Solutions
Database Systems: Design, Implementation, & Management
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- A three-page summary should explain traits and factors.arrow_forwardExplain what an entity-relationship model is and how it works.arrow_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_forward
- Please describe what an entity-relationship model is as well as how it functions.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_forwardWhat exactly is meant to be accomplished by using an Entity-Relationship Model, and how is this model used?arrow_forward
- A derived attribute can be stored in a table or calculated on each occasion that it is required. An example of a derived attribute is your Grade Point Average which is calculated by adding together a score for each unit (e.g., HD=4, D=3, C=2, P=1, N=0) and dividing that by the number of units you have completed. Explain how the decision as to whether the Grade Point Average would be stored in a table or calculated would be made. You are administering a database in a large retail company that records sales at each of the company’s stores. Tuning the database to improve performance by adding indexes and optimising query execution is an important ongoing aspect of the physical database design. Which attributes in a database such as this (apart from the primary key) are likely to BENEFIT from being indexed? Which attributes would you generally avoid indexing, and why?arrow_forwardFor selection sizes where the necessary value is less than or equal to 15, please elaborate on how you may hazard an estimate. I'm wondering how large a pool of potential employees you expect there to be. If the values in the same histogram have a normal distribution between 11 and 15, then an estimated value of 13 may be used as the selection criteria. Simply respond to this inquiry with some text.arrow_forwardHow do the characteristics or attributes of greatest importance in qualitative or quantitative type differ? Give an example.arrow_forward
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