Distinguish Between Entity Identifiers And Keys.

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Distinguish Between Entity Identifiers And Keys.

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54)An entity identifier is an attribute or group of attributes that the users use to name or identify instances of an entity class. Unlike a key in the relational model, an entity identifier is more of a logical concept. It is simply an attribute that the users think of as distinguishing between entity instances in their environment. Also, entity identifiers may be unique or non-unique while keys must be unique. If an entity identifier is unique it will identify a single instance of the entity class. If the identifier is non-unique it will identify a set of instances of the entity class.
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