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Explain the persistent class maps to one relational table
In most of cases, persistent class maps to one relational table (keeping aside inheritance issue, for the moment). In simplest model, a class from logical model maps to a relational table either in whole or in part. Logical extension is that a single object (or instance of a class) maps to a single table row.
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Provide an abstract superclass called EnergyRecord and subclasses called Contract and Transaction with default constructors (no-arg) and full-arg, overloaded constructors. Collect
ER Diagram for Safe Home Systems
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