Aggregate Data. Aggregate data is, as the name says, data available only in aggregate form. Typical examples are: Turnout for each canton in federal elections: Count (aggregated from individual voters) compared to the overall number of citizens having the right to vote .
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Aggregation is a term which is used to refer one way relationship between two objects . For example, Student class can have reference of Address class but vice versa does not make sense.
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