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    Question

    What does the "Projection" operation in relational

    algebra do?
    A Selects certain rows from a relation Correct Answer Incorrect Answer
    B Combines two relations into one Correct Answer Incorrect Answer
    C Selects certain columns from a relation Correct Answer Incorrect Answer
    D Sorts the relation in ascending order Correct Answer Incorrect Answer

    Solution

    Selects certain columns from a relation

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