Suppose “Professor” and “CourseSection” are two entity types with the relationship that “Professor” teaches “CourseSection”. Assume that a CourseSection is taught by only one professor and based on what you generally know about Professors and CourseSections, what type of relationship would this be?
| One to One |
| One to Many |
| Many to One |
| Many to Many |
Suppose “Professor” and “CourseSection” are two entity types with the relationship that “Professor” teaches “CourseSection”. Assume...
1) A university database contains information about professors (identified by emp_id) and courses (identified by course_id). Professors teach courses. Each of the following situations concerns the Teaches relationship set. For each situation, draw an ER diagram that describes it (assuming no further constraints hold). a) Professors can teach the same course in several semesters, and each offering must be recorded. b) Professors can teach the same course in several semesters, and only the most recent such offering needs to be...
Identify all entity types, attributes, relationship types and their degrees in the following case Hence draw an entity-relationship diagram An organization makes many models of cars where a model is characterized by a name and a suffix (such as GL or XL which indicates the degree of luxury) and an engine size. Each model is made up from many parts and each part may be used in the manufacture of more than one model. Each part has a description and...
Write a scenario and the corresponding ERD that would display at least 5 entity types, at least one relationship type of each multiplicity (one-to-one, one-to-many, many-to-many), at least one complex relationship type (degree 3 or more), and at least one recursive relationship type. The model should also feature at least one derived attribute and one composite attribute.
This is symbolized by a circle over a single line in an entity relationship diagram. It signifies that the supertype does NOT have to be one of the specified subtypes. Partial completeness Total completeness System completeness Associative completeness A supertype entity can contain as many as ____ subtype entities. 10 1 100 no defined limit When you set up an Entity Relationship Diagram, and have a many-to-many relationship, this entity is created to avoid problems inherent to a many-to-many relationship....
The following are the main entity types of the academic institution database. For each entity type, we provide some of the corresponding attributes. Use this information in order to: (a) Build an Enhanced E-R diagram; (b) Transform the Enhanced E-R diagram to a relational database. Identify the primary key(s) and the foreign key(s) for each relation. Draw the relational integrality constraints; (c) For each of the relations created, indicate its normal form. If the relation is not in the 3NF,...
please help with the entities and relationship
Database Design The Jefferson Dance Club teaches social dancing and offers both private and group lessons. Jefferson charges $45 per hour per student (or couple) for a private lesson and $6 per hour per student for a group lesson. Private lessons are offered throughout the day, from noon untl 10 .M, six days a week. Group lessons are offered in the evenings. Jefferson employs two types of instructor: full-time salaried instructors and part-time...
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RealGree uses the paper form as below to record the weekly (just one week in this 5. A lawn and tree care company ion) informati application to keep track of the information of the part-time employees. Please (a) develop the E-R diagram (8 points). ion about is part-time employees (one form for one employee). The company asks...
Question 29 What entity type is used to convert a many-to-many relationship to two one-to-many relationships? repeating entity intersection entity associative entity attributive entity Question 30 A many-to-many relationship can be directly modeled in a relational database such as Microsoft Access. True False Question 31 Which order is correct for the designer to normalize a data structure? I. Remove all repeating groups and identify the primary key. II. Remove any transitive dependencies. III. Remove all partial dependencies and place them...
Topics: Data Modeling: Project: 1. Draw an entity-relationship diagram that describes the following business environment. The city of Chicago, IL, wants to maintain information about its extensive system of high schools, including its teachers and their university degrees, its students, administrators, and the subjects that it teaches. Each school has a unique name, plus an address, telephone number, year built, and size in square feet. Students have a student number, name, home address, home telephone number, current grade, and age....
a. Suppose that a model of a music library does not model ‘artist’ as an entity set, but instead models it as an attribute of a track. This could lead to what the authors of our text call ‘incompleteness’. Why would the they call this model incomplete? Is it because a) not all artist information could be contained as an attribute of a track, b) it would not be possible to model an artist before that artist released any tracks,...