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

What are the various states of transaction process, What are the various st...

What are the various states through which a transaction passes through in its lifetime?  Briefly discuss all the events that causes transition from one state to another.   Ans:

Improve efficiency in query evaluation, Question: AirwaysCentre, an int...

Question: AirwaysCentre, an international airline booking company currently uses a relational database system for their operations, which includes the following relations: P

Explain five duties of database administrator, Explain five duties of Datab...

Explain five duties of Database Administrator? 1. DBA administers the three stages of the database and, in consultation along with the whole user community, sets up an defin

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

Give expression in tuple calculus and domain calculus, Consider the subsequ...

Consider the subsequent relation schemes:  Project (Project#, Project_name, chief_architect)  Employee (Emp#, Empname)  Assigned_To (Project#, Emp#)  Give expression i

What is the meaning of data independence, What is the meaning of Data indep...

What is the meaning of Data independence? Data independence means a programs that are not dependent on the physical attributes of data and a programs that are not dependent on

What disadvantage of odbc does ole db overcome, What disadvantage of ODBC d...

What disadvantage of ODBC does OLE DB overcome? By breaking the features and the methods of a DBMS into COM objects, OLE DB characteristic overcomes a main disadvantage of ODBC

What is bankers algorithm, What is banker's algorithm?  Banker's algori...

What is banker's algorithm?  Banker's algorithm is a deadlock avoidance algorithm that is applicable to a resource-allocation system with multiple instances of each resource ty

What are the uses of the information in the data dictionary, What are the u...

What are the uses of the information in the Data dictionary? The following information is directly taken from the Data dictionary: Information on fields displayed with

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