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Adding Redundant Associations for Efficient Access
The expression redundant association means using "duplicate association for proficient access". While analysis, it is not a good idea to have redundancy in association network since redundant associations do not add any information. During design, however, we should evaluate structure of the object model for implementation.
Describe an data dictionary? A data dictionary is a data structure which keeps meta data about the structure of the database ie. the schema of the database.
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
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