Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 4, Problem 19RQ
What two attributes must be contained in the composite entity between STORE and PRODUCT? Use proper terminology in your answer.
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Given the ER diagram above, answer the following questions:
a. Name an entity type that has more than 2 relationships.
b. Name one ket attribute and the entity type it belongs to.
c. Name one one-to-one relationship and the entity types it relates.
d. Name one many-to-many relationship and its entity types.
e. Name one relationship attribute.
f. What is the cardinality of relationship ‘employs’?
g. What is the cardinality of relationship ‘textUsed’?
h. Name one weak entity type
i. Does it have a partial key? If yes, name it. ii. Name its identifying entity type
iii. Name its identifying relationship
Question 2 A bank provides services to customers. The banks is identified by its code and has a name and an address. The bank has several branches. A branch is identified by its code that is unique for a given bank. The branch name and address are also stored in the database.
Customers deal with the bank through the bank branches. So, a customer belongs to a specific bank branch. Customers…
The course I'm taking is database management.
I have attached the question. Please provide solution in detail so i can better understand why. Thank you in Advance!
please answer with proper explanation and step by step solution.
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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- Make Entity Relationship Diagram (ERD) about salesforce.com, include at least 4 entities, list a handful of attributes for each entity, and use verb phrase to show how those entities are related to one another. Example is attached belowarrow_forwardA manufacturing company produces products. The following product information is stored: product name, product ID and quantity on hand. These products are made up of many components. Each component can be supplied by one or more suppliers. The following component information is kept: component ID, name, description, suppliers who supply them, and products in which they are used. Create an ERD to show how you would track this information. Show entity names, primary keys, attributes for each entity, and relationships between the entities. Assumptions: • A supplier can exist without providing components. • A component does not have to be associated with a supplier. • A component does not have to be associated with a product. Not all components are used in products. • A product cannot exist without components.arrow_forwardWhat is the term used to describe a non-key attribute in one entity that points to the primary key in another entity?arrow_forward
- What is the attribute that could be obtained using other attributes in the Entity-Relationship Diagram? Select one: a.Multi-Valued Attribute b.Derived / Calculates Attribute c.Single-Valued Attribute d.Composite Attributearrow_forwardPrepare 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_forwardDraw this ER Diagram, but note that: Ths diagram should adhere to compressed Chen notation : The ER diagram consists of four entities: Pet, Challenge, User, and Vote. The Pet entity has attributes such as id (primary key), name, species, age, and description to store information about each pet profile. The Challenge entity has attributes such as id (primary key), pet1_id and pet2_id (foreign keys referencing the Pet entity), start_date, end_date, and likes to store information about each challenge between two pets. The User entity has attributes such as id (primary key), name, and email to store information about users who participate in voting and challenge creation. The Vote entity has attributes such as id (primary key), challenge_id (foreign key referencing the Challenge entity), user_id (foreign key referencing the User entity), and vote to store information about user's vote for a particular challenge.arrow_forward
- can you help me with the following question? The dealership sells both new and used cars, and it operates a service facility. Use the following business rules to create a Crow’s Foot ERD. Write all appropriate connectivities and cardinalities in the ERD. Show entity names, primary keys, attributes for each entity, relationships between the entities and foreign key. A salesperson may sell many cars, but each car is sold by only one salesperson. A customer may buy many cars, but each car is bought by only one customer. A salesperson writes a single invoice for each car he or she sells. A customer gets an invoice for each car he or she buys. A customer may come in just to have his or her car serviced; that is, a customer need not buy a car to be classified as a customer. When a customer takes one or more cars in for repair or service, one service ticket is written for each car. The car dealership maintains a service history for each of the cars serviced. The service records are…arrow_forwardUsing the following E-R diagram, create a set of 3NF relations. Create all primary keys and nonkey attributes needed for each entity.arrow_forwardPlease answer these 5 multiple choice questione by looking at this ERD diagram below. Thank you in advance. 1. Customer is: A. An attribute B. An entity. C. A relationship D. A query 2. Match one of these to store_ID and one of these fo Customer_ID -An entity in Customer - A composite key in Customer -A foreign key in Customer - A composite attribute in Customer - A primary key in Customer . 3. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table. The table with the foreign key is called the child table and the table with the primary key is called the referenced or parent table True oe False? 4. First Name in Customer is a good candidate for primary key True False? 5. The relationship Store to Customer from the ERD is A. One to many , non-identifying , mandatory on one side optional on the other B. One to many, identifying,mandatory on one side optional on the other C. One to many, non- identifying,…arrow_forward
- In an entity-relationship diagram, what does cardinality mean? 1:The data is saved concerning a single, individually identified element. 2:In a connection, the maximum number of entity instances 3:An entity's total number of primary keys 4:An entity's total amount of characteristicsarrow_forwardAnswer these 4 questions (1) Draw the Relational Schema for the relationship(s) between STORE and REGION.(2) Describe the type(s) of relationship(s) between EMPLOYEE and STORE. (Hint: Each store employs many employees, one of whom manages the store.)(3) Draw the Relational Schema for the relationship(s) between EMPLOYEE and STORE.(4) Draw the Full Entity Relationship diagram showing the relationships among EMPLOYEE, STORE, and REGION.arrow_forwardThe question is in the image below.arrow_forward
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