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== General Organization of Data ==
In general the first aspect ("[[database model]]") describes the following :
# ''Structure:'' defines how data are organized (hierarchical, network, relational, object-oriented).
# ''Integrity:'' provides a language for the definition of rules that restrict which instances of the defined structure are allowed.
# ''Manipulation:'' provides a language in which updates of the data can be expressed.
# ''Querying:'' provides a language in ''which'' the data can be queried.
For example in the [[relational model]] all data is represented by
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