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Entity - Relationship Diagrams) 1) Go to the following website and read through what entity -...

Entity - Relationship Diagrams)

1) Go to the following website and read through what entity - relationship diagrams are:


http://www.cems.uwe.ac.uk/~tdrewry/lds.htm

Now, try writing logical data structures (LDS) [or entity-relationship diagrams] for the following situations:


A) You are at a restaurant. The server asks "What wine would you like with this course?" What are the entities, and what are the relationships that would allow you to track the wine with each course?"

B) Imagine that you want to keep track of articles found in different magazines and journals. What are the entities and relationships that would be used?

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Answer #1

A)

Entities: Course,Wine

Relationships: One Course can have different kinds of Wines. One Wine can be Part of different Courses (M:N)

B)

Entities: Articles, Magazine,Journal

Relationships: One Magazine has many Articles. (1:M)

One Journal has many Articles . (1:M)

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