relationship between entities and attributes.

A rental car company divides its cars into four categories: small, mid-size, full-size, and sport utility. The agency wishes to collect the following information from all vehicles: Vehicle, Make, Model, Year, and Color are all required. There are no distinguishing characteristics for any of the four vehicle classifications. Rents is a connection between the entity type vehicle and the entity type client. There is no one-to-one connection between any of the four vehicle types and any entity type. Would you think about making a supertype/subtype connection for this problem? If so, why or why not?

In 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.

It is possible to have both a primary key and a candidate key for the same attribute.

Primary key identifies a unique tuple of a relation, true or false?

An attribute of a composite primary key has a candidate key. What is your response to this information?

Swing Jazz Club ERD Problem Follow the Simple Procedure for ERD diagramming to design an ERD using the following user provided information.   Remember the ERD will eventually turn into the design for a database from a top down view.  Make sure you resolve any many to many conflicts.  Label an identifier or primary key and all pertinent attributes given.   If an attribute is not readily apparent from the user information, then make one up that makes sense for the particular entity.  Therefore, all entities should end up with at least an identifier and another attribute that makes sense.  You may use any of the approaches shown by the book, though the ER-Model and Crow’s foot are the most common.  Make sure you show entities, relationships, cardinality, and optionality.  Swing Jazz Club The Swing Jazz Club teaches swing and jazz dancing and offers both private and group lessons.  Swing Jazz charges $60 dollars per hour for a private lesson and $10 dollars per hour for a group lesson.…

Question 4 T 4.1) Given the following information, for each one of the BOLD words (note there are 3 in each one), specify whether the word will be mapped into an entity, attribute, relationship, or value in the corresponding database. I a) The make of my Red vehicle is Chevy. Chevy is an Entity, make is the relationship, vehicle is the attribute b) Instructor Smithy teaches three courses. Teaches is the value, instructor is attribute, smithy is the entitiy W M.