Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 4, Problem 20RQ
Describe precisely the composition of the DEPENDENT weak entity’s primary key. Use proper terminology in your answer.
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Attributes from the identifying entity set's main key may be added to a weak entity set to make it strong. Please describe the overlap that will develop as a result of our choice.
What are the differences between weak and strong entity sets?
1. Describe entity constraint in your own words
2. what type of key satisfies the uniqueness property but not the minimality property?
Chapter 4 Solutions
Database Systems: Design, Implementation, & Management
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - Prob. 11RQCh. 4 - Discuss two ways in which the 1:M relationship...
Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11C
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- Explain the usage of attributes and the generic name for attribute in the relationship model.arrow_forwardThe difference between a weak entity set and a strong entity set should be explained.arrow_forwardWhat is the definition of "weak entity type"? Does it have a secret? Can you elucidate what "attribute" means?How would sia appear on an ER chart? Please depict with a diagram.arrow_forward
- Give an explanation of the entity-relationship model's operation.arrow_forwardUsing the above table structure, create a normalized Entity-Relationship Model (ERM). Identify Primary Key(s) and Foreign Key(s) for all the entities, connectivities and/or cardinalities, and relationships between the entities. As for Chen's ERM notation and the normalization, the level should be in Third Normal Form (3NF) and above. [Note: you do notneed to show the normalization process such as the functional dependency diagram.]arrow_forwardUsing the above table structure, create a normalized Entity-Relationship Model (ERM). Identify Primary Key(s) and Foreign Key(s) for all the entities, connectivities and/or cardinalities, and relationships between the entities. As for Chen's ERM notation and the normalization, the level should be in Third Normal Form (3NF) and above. [Note: you do notneed to show the normalization process such as the functional dependency diagram.]arrow_forward
- Just what does "weak entity type" mean? Is there a secret to it? Can you explain the meaning of "attribute"?How does sia look like on an ER chart? Please illustrate with a diagram.arrow_forwardAdding the necessary characteristics to any weak entity set will automatically transform it into a strong entity set. Why, however, do we have such a lackluster collection of entity sets?arrow_forwardWe can convert any weak entity set to a strong entity set by simply adding appropriate attributes. Why, then,do we have weak entity sets? (a) We want to avoid the data duplication and consequent possible inconsis- tencies caused by duplicating the keyof the strong entity set.(b) Weak entities reflect the logical structure of an entity being dependent on another entity.(c) Weak entities can be deleted automatically when their strong entity is deleted.(d) All of the above.arrow_forward
- Prepare a Crow’s Foot Entity Relationship Diagram for the application described in the following paragraph. Many-to-Many relationships should be broken into two 1-to-Many relationships using a bridge entity. Label PK attributes and FK when applicable. For each entity, you need to define a primary key. If there is a relationship between two entities make sure you define the corresponding foreign key in the child table. Seneca Sandlot Baseball is a recreational baseball league for Seneca students. The league has different divisions for different skill levels. Each player’s skills are evaluated and the player is assigned to a division. A team is made up of many players from the same division, and a coach. A player may play on only one team in the league. Each division is made up of many teams. A coach may coach teams in more than one division , but can only coach one team in each division. A coach may not play on any team in the league. A season is twelve weeks in length.…arrow_forwardIn order to be used as a primary key, which of these characteristics must an attribute possess with respect to a single instance of the entity? There must be a maximum of one attribute instance. There must be many instances of the attribute. There must be at most one entity instance that each attribute instance describes. There must be at least one instance of the attribute. There must be zero or more instances of the attribute.arrow_forwardExplain how functional dependencies can be used to indicate the following: A one-to-one relationship set exists between entity sets student and Instructor. A many-to-one relationship set exists between entity sets student and instructor.arrow_forward
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Enhanced Entity Relationship Model; Author: Data Science Center;https://www.youtube.com/watch?v=ocQUtXPumdQ;License: Standard YouTube License, CC-BY