Consider the E-R Diagram below. It depicts the World Music Association, an organ

Question

Consider the E-R Diagram below. It depicts the World Music Association, an organization that maintains information about its member orchestras and the recordings they have made. The diagram shows the information about the orchestras and their musicians across the top and information about the recordings in the rest of the diagram. Cardinalities and any associative entities are not given. You are to provide this information, some of which will be entered in the tables below.

Remember that when you have two many-to-many cardinalities on either side of a relation, you must have an associative entity between those two entities.

Relations and their cardinalities (2 points each)

(do not consider any possible associative entities in this table

Consider the E-R Diagram below. It depicts the World Music Association, an organization that maintains information about its member orchestras and the recordings they have made. The diagram shows the information about the orchestras and their musicians across the top and information about the recordings in the rest of the diagram. Cardinalities and any associative entities are not given. You are to provide this information, some of which will be entered in the tables below. Remember that when you have two many-to-many cardinalities on either side of a relation, you must have an associative entity between those two entities.

Explanation / Answer

a) cardinality means the numbers of elements in a Set.

so if A = {1,2} then it has a cardinality of 2

b) O and N both have infinite number of elements in the Set.. so they have the same cardinality

c) & d) will also follow the above argument

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