Determine candidate and primary key, Database Management System

Assignment Help:
  • A video rental company has several branches.
  • The data held on each branch is the branch address made up of street, city, state, and zip code, and the telephone number.
  • Each branch is given a branch number, which is unique. Each branch is allocated staff, which includes a Manager. The Manager is responsible for the day-to-day running of a given branch.
  • The data held on a member of staff is his or her name, position, and salary. Each member of staff is given a staff number, which is unique.
  • Each branch has a stock of videos. The data held on a video is the catalog number, video number, title, category, daily rental, cost, status, and the names of the main actors, and the director. The catalog number uniquely identifies each video. However, in most cases, there are several copies of each video at a branch, and the individual copies are identified using the video number.
  • A video is given a category such as Action, Adult, Children, Drama, Horror, or Sci-Fi. The status indicates whether a specific copy of a video is available for rent.
  • Before hiring a video, a customer must first register as a member. The data held on a member is the first and last name, address, and the date that the member registered at a branch.
  • Each member is given a member number, which is unique. Once registered, a member is free to rent videos, up to maximum of ten at any one time.
  • The data held on each video rented is the rental number, the name and number of the member, the video number, title, and daily rental, and the dates the video is rented out and date returned. The rental number is unique.

(a)   Identify the main entity types of the company.

(b) Identify the main relationship types between the entity types and determine the multiplicity constraints for each relationship

(c)   Identify attributes and associate them with entity or relationship types.

(d)  Determine candidate and primary key attributes for each (strong) entity type.

(e)  Using your answers (a) to (d) create a single ER diagram. State any assumptions necessary to support your design.


Related Discussions:- Determine candidate and primary key

Abstract data structures, The C_Artist  application will be developed using...

The C_Artist  application will be developed using the C language (C99 standards) and will be able to compile without warnings and link and run in the Swinburne computer laboratorie

ER model, coventions for displaying an ER schema as ER diagram

coventions for displaying an ER schema as ER diagram

Identify all renters who have viewed all properties, Consider the subsequen...

Consider the subsequent relations RENTER(rno, fname, lname, address, tel_no, pref_type, max_rent) VIEWING(rno, pno, date, comment) PROPERTY_FOR_RENT( pno, street, area ,city,

Wound-wait scheme-deadlock prevention, " Wound-wait" scheme : It is based o...

" Wound-wait" scheme : It is based on a preemptive method. It is based on a simple rule:                   If Ti requests a database resource that is held by Tj

Write query to list the staff who work within the branch, Consider the foll...

Consider the following relations: BRANCH( bno, street, area, city, pcode, Tel_no, Fax_no) STAFF( Sno, Fname, Lname, address, position , salary, bno) Express the subsequent qu

Relation schema for student, Example RELATION SCHEMA for STUDENT: STU...

Example RELATION SCHEMA for STUDENT: STUDENT (Roll No: string, name: string, login: string, age: integer) RELATION INSTANCE

Computer, 1. Will you advise that your organization uses open source softwa...

1. Will you advise that your organization uses open source software and why? 2. Why is it important for business managers to have a basic understanding of the software development

Illustrate system design of an object oriented approach, System Design: An ...

System Design: An Object Oriented Approach Any software systems always try to change and evolve as technology and business rules evolve. The development of information systems

Describe in brief about the sequence diagrams, Describe in brief about the ...

Describe in brief about the Sequence Diagrams Sequence diagrams are interaction diagrams which emphasize time ordering of messages. In UML, it is shown as a table which shows

Define hash files organization, Define Hash files organization a. Hashi...

Define Hash files organization a. Hashing includes computing the address of a data item by calculating a function on the search key value.   b. A hash function h is a functi

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd