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A merchant shipping company wishes to use a computer database to help with its operations. There are three distinct areas in which such assistance is
A merchant shipping company wishes to use a computer database to help with its
operations. There are three distinct areas in which such assistance is desired.
First, it is required that details of the company fleet be recorded. The fleet
comprises a number of types of ship: cargo vessels have a deadweight cargo capacity
class of cargo carried eg dry, container, grain and number of onboard loading derricks;
oil tankers also have a deadweight, and a class of petroleum for which they are equipped;
and passenger vessels have a maximum passenger capacity for each of first and
tourist classes, and a number of staterooms. All ships have a crew, which comprises, a
master, a number of officers and seamen. They have length, beam, draught and
displacement, and burn particular types of fuel. They also have a maximum speed and
endurance. Each ship has a home port, which may or may not be the same as its port of
registration.
Secondly, the officers and crew have to be paid! Their salary depends on their
qualifications and current appointment to which ship and in what capacity. There is
also a bounty payment made in respect of each trip made, which depends on the length
of the trip and on the individuals length of service with the company. In addition, ships
officers who are sailing in less than their customary capacity eg a master sailing as a
first mate receive an extra payment.
Finally, the company is required by its insurers to maintain a record of the
position of each vessel; its port and date of departure, destination and estimated date of
arrival; number of officers, total number on board, and total value of cargo carried, if any.
Ships currently in dock for repairs must also be included in this catalogue.
Required
Construct an ER diagram from the description above. Include required attributes
to make the data storage meaningful. marks
Use your research initiative to determine three other entities and their attributes
that are of importance to this model.
a Write a paragraph explaining their importance and relationship with the
other entities. marks
b In a separate diagram show how they should added to your ER diagram.
marks
Based on the final ER model developed part above define the file structure
using relational notation. marks
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