In general, any number of entity types may participate in the same relationship, but
in practice it is unusual to find a need for relationships which involve more than three or
four entity types. Relationships between two entity types are adequate for most
purposes, so take care not to complicate conceptual models through the unnecessary
inclusion of more complex relationships.
Questions
1.There may be many parts in a supplier’s catalogue which are not currently the
subject of a contract with a customer. Similarly, a supplier may be granted approved-
supplier status by a customer, even though no contract is in force. Assuming that
SuppPartCust in Fig. ...
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