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Depending on the sophistication of the application development software, nulls can create problems when functions such as COUNT, AVERAGE, and SUM are used.
Q1: The main concern with redundant relationships is
Q2: Most current-generation relational DBMSs perform automatic query
Q15: Which of the following is a personal
Q23: A attribute can be further subdivided to
Q27: In which two cases are composite primary
Q34: The proper use of keys is crucial
Q34: The scenario is typical of most mainframe
Q57: A occurs when there is one entity
Q59: Today, most relational database products can be
Q70: In the model, the basic logical structure