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Chapter 5 - Review Questions

Chapter 5 - Review Questions - a short vertical line a...

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1 Marks: 5 What is a “thing” called in the object-oriented approach? A "thing" is called an object that interacts with the system. 2 Marks: 5 What are attributes and compound attributes? An attribute is one piece of specific information about a 'thing' and a compound attribute is an attribute that contains a collection of related attributes. 3 Marks: 5 What are the symbols shown on an entity-relationship diagram? Rectangles represent data entities and the lines connecting the rectangles show the relationship between the data entities. On the lines connecting the rectangles are also the "crow's feet" symbol to indicate 'many', an empty oval which indicates zero or more (optional) when connected to the crow's feet, an empty oval which represents zero or one (optional) when next to
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Unformatted text preview: a short vertical line, a short vertical line which represents exactly one (mandatory) and a short vertical line next to crow's feet represents one or more (mandatory). 4 Marks: 5 What are the symbols shown on a domain model class diagram? 1.) Rectangle - Represents classes 2.) Line - Connects rectangles to show associations among classes 5 Marks: 5 How is multiplicity show in a domain model class diagram? 1.) 0. .1 - Zero or one (optional) 2.) 1 - One and only one (mandatory) 3.) 1. .1 - One and only one alternate (mandatory) 4.) 0. .* - Zero or more (optional) 5.) * - Zero or more alternate (optional) 6.) 1. .* - One or more (mandatory)...
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