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Identification of concurrency
Identification of concurrency: Dynamic model identifies concurrency. Two objects are said to be parallel (concurrent) if they can receive events at the same time. Concurrent objects are required to be assigned to several threads of control.
Figure: Concurrency without synchronization
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
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a brief definition
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