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Exercise 2.3.2: This exercise introduces another running example, concerning World War II capital ships. It involves the following relations: Classes (class, type, country, numGuns, bore, displacement) Ships (name, class, launched) Battles (name, date) Outcomes (ship, battle, result) Ships are built in "classes" from the same design, and the class is usually named for the first ship of that class. The relation Classes records the name of the class, the type ('bb' for battleship or 'bc' for battlecruiser), the country that built the ship, the number of main guns, the bore (diameter of the gun barrel, in inches) of the main guns, and the displacement (weight, in tons). Relation Ships records the name of the ship, the name of its class, and the year in which the ship was launched. Relation Battles gives the name and date of battles involving these ships, and relation Outcomes gives the result (sunk, damaged, or ok) for each ship in each battle. Write the following declarations: a) A suitable schema for relation Classes. b) A suitable schema for relation Ships. c) A suitable schema for relation Battles. d) A suitable schema for relation Outcomes. e) An alteration to your Classes relation from (a) to delete the attribute bore. f) An alteration to your Ships relation from (b) to include the attribute yard giving the shipyard where the ship was built.

Exercise 2.3.2: This exercise introduces another running example, concerning World War II capital ships. It involves the following relations: Classes (class, type, country, numGuns, bore, displacement) Ships (name, class, launched) Battles (name, date) Outcomes (ship, battle, result) Ships are built in "classes" from the same design, and the class is usually named for the first ship of that class. The relation Classes records the name of the class, the type ('bb' for battleship or 'bc' for battlecruiser), the country that built the ship, the number of main guns, the bore (diameter of the gun barrel, in inches) of the main guns, and the displacement (weight, in tons). Relation Ships records the name of the ship, the name of its class, and the year in which the ship was launched. Relation Battles gives the name and date of battles involving these ships, and relation Outcomes gives the result (sunk, damaged, or ok) for each ship in each battle. Write the following declarations: a) A suitable schema for relation Classes. b) A suitable schema for relation Ships. c) A suitable schema for relation Battles. d) A suitable schema for relation Outcomes. e) An alteration to your Classes relation from (a) to delete the attribute bore. f) An alteration to your Ships relation from (b) to include the attribute yard giving the shipyard where the ship was built.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Exercise 2.3.2: This exercise introduces another running example, concerning World War II capital ships. It involves the following relations: Classes (class, type, country, numGuns, bore, displacement) Ships (name, class, launched) Battles (name, date) Outcomes (ship, battle, result) Ships are built in "classes" from the same design, and the class is usually named for the first ship of that class. The relation Classes records the name of the class, the type ('bb' for battleship or 'bc' for battlecruiser), the country that built the ship, the number of main guns, the bore (diameter of the gun barrel, in inches) of the main guns, and the displacement (weight, in tons). Relation Ships records the name of the ship, the name of its class, and the year in which the ship was launched. Relation Battles gives the name and date of battles involving these ships, and relation Outcomes gives the result (sunk, damaged, or ok) for each ship in each battle. Write the following declarations: a) A suitable schema for relation Classes. b) A suitable schema for relation Ships. c) A suitable schema for relation Battles. d) A suitable schema for relation Outcomes. e) An alteration to your Classes relation from (a) to delete the attribute bore. f) An alteration to your Ships relation from (b) to include the attribute yard giving the shipyard where the ship was built.
Transcribed Image Text:Exercise 2.3.2: This exercise introduces another running example, concerning World War II capital ships. It involves the following relations: Classes (class, type, country, numGuns, bore, displacement) Ships (name, class, launched) Battles (name, date) Outcomes (ship, battle, result) Ships are built in "classes" from the same design, and the class is usually named for the first ship of that class. The relation Classes records the name of the class, the type ('bb' for battleship or 'bc' for battlecruiser), the country that built the ship, the number of main guns, the bore (diameter of the gun barrel, in inches) of the main guns, and the displacement (weight, in tons). Relation Ships records the name of the ship, the name of its class, and the year in which the ship was launched. Relation Battles gives the name and date of battles involving these ships, and relation Outcomes gives the result (sunk, damaged, or ok) for each ship in each battle. Write the following declarations: a) A suitable schema for relation Classes. b) A suitable schema for relation Ships. c) A suitable schema for relation Battles. d) A suitable schema for relation Outcomes. e) An alteration to your Classes relation from (a) to delete the attribute bore. f) An alteration to your Ships relation from (b) to include the attribute yard giving the shipyard where the ship was built.
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