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The collection of FDs that describe an n-ary relationship must have n components: n – 1 on the left side (determinant) and 1 on the right side. 6. In a more complex database, other types of FDs may also exist within an n-ary relationship. When this occurs, the ER model does not provide enough semantics on its own, and it must be supplemented with a narrative description of these dependencies. 5 Exclusion Constraint The normal, or default, treatment of multiple relationships is the inclusive OR, which allows any or all of the entities to participate.

Control flows to the first activity, where the customer requests a quote (Request quote). Control remains in an activity until that activity is completed; then the control follows the outgoing arrow. When the request for a quote is complete, the Manufacturer generates a quote (Generate quote). Then the Customer reviews the quote (Review quote). The next construct is a branch, represented by a diamond. Each outgoing arrow from a branch has a guard. The guard represents a condition that must be true in order for control to flow along that path.

Also, if the minimum and maximum are the same number, then the multiplicity can be written as a single number. For example, [1 .. 1] means the same as [1]. Optional existence can be specified using a zero. The [0 .. , is upper management), or one Department. Mandatory existence is specified whenever a multiplicity begins with a positive integer. 2 means an Employee is an occupant of exactly one Office. book Page 40 Saturday, July 16, 2005 12:57 PM 40 CHAPTER 3 The Unified Modeling Language (UML) association can indicate mandatory existence, while the other end may use optional existence.

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