Question: The result of a SELECT statement can contain duplicate rows.Select one: True False 2. Which of the Following Is Not A DatabaseModel? Select one: a.

The result of a SELECT statement can contain duplicate rows.Select one: True False

2. Which of the Following Is Not A DatabaseModel? Select one: a. Network Database Model b. Relational DatabaseModel c. Object Oriented Database Model d. None of the above

3. Theunique constraint specifies that the value of an attribute must bedifferent from all other values of the same attribute that existwithin a relation. Select one: True False

4. Select the BESTanswer. In a real relational database system, if you try to join(natural join) tables R and S and R is empty (that is, it has notuples), Select one: a. the system reports an error. b. the answerset is an empty table. c. the answer set is the same as table S. d.the answer set consists of just one row. e. an answer set isreturned; however, the results are system dependent.

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