Assignment - 1 - redoing to improve grades, Database Management System

Assignment Help:
Assignment #1
Data Management

The questions on this exam are based on the Baxter Aviation case scenario.

1. (5 points) The systems analyst proposes the following two relationships between the Flight and Pilot entities:



What question do you need to answer to decide which of the relationships is correct? (Hint:The answer requires only one sentence.)

2. A part of the initial ER diagram for the Baxter Aviation database appears as follows:






(a) (5 points) State in words the meaning of this relationship.

(b) (5 points) Why can’t this relationship be represented directly in a relational database?

(c) (5 points) Redraw the diagram so that it is compatible with the design of a relational database.

3. (10 points) Assume that you have been presented with the following relation for the Baxter Aviation database:

Charters (Pilot#, Pilot name, Aircraft ID#, #seats, Village, Flight#, Flight date, Flight time, Customer#, Customer name)

(a) How many entities are represented by this relation?

(b) What is the primary key of this relation? (Hint: Flight# is unique; flight numbers do not repeat as they do on commercial airlines with regularly scheduled flights. Each flight can go to many villages and over time a village can receive many flights.)


(c) Give a specific example of one insertion anomaly present in this relation.

(d) Give a specific example of one deletion anomaly present in this relation.

(e) Is this relation in first, second, or third normal form? Why?


4. A portion of the Baxter Aviation database is as follows:

Aircraft (Aircraft ID #, Make, Model, #seats, total airtime, hours on engine)
Village (Village name, Type of runway)
Flight (Flight time, Flight date, Aircraft ID#, Flight#, Customer #)
Destinations (Flight#, Village name)
Customers (Customer name, House number, Phone, Customer #)


(a) (5 points) Identify the primary key for each relation.

(b) (5 points) Identify all foreign keys and the primary keys they reference.

(c) (10 points) List all the constraints that must be verified whenever a row is inserted into the Flight relation. (In other words, what are the specific integrity checks that must be made?) In your list, indicate exactly which attributes are being checked and the specific test(s) being performed on each. (hint: Here’s a partial example: The database needs to validate that the primary key of the relation is unique.)

Related Discussions:- Assignment - 1 - redoing to improve grades

Data dictionary, The database is to record information about artists for a ...

The database is to record information about artists for a (music) production company. An artist is the name of a singer or band; the name of the artist, the year the artist started

Database, A database has been designed for this beauty parlour in order for...

A database has been designed for this beauty parlour in order for the staff to manage specific things such as bookings made by clients, payments, staff availability, level of exper

E - r schema with weak entity, Consider the E/R schema with weak entity set...

Consider the E/R schema with weak entity sets shown below. Come up with the SQL CREATE TABLE statements (with appropriate primary key, unique and foreign key constraints). Include

Data analysis and design, give some example real-life situations where DBMS...

give some example real-life situations where DBMS are most suiitabe

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

coventions for displaying an ER schema as ER diagram

Concurrency executions, Explain TPS concurreny executions stating their adv...

Explain TPS concurreny executions stating their advantages in online business advancement

Explain concurrency control, Explain concurrency control? Concurrency ...

Explain concurrency control? Concurrency control Oracles multiversion concurrency control varies from the concurrency mechanism used by some other data base vendors. Read

Create an index for the table client, Create an index for the table Client,...

Create an index for the table Client, field CLIENT_NO of Q ? Command:   CREATE INDEX client_client_no ON client(client_no);

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