(Solution) - Certain systems allow marked nulls A marked null i is eq -(2025 Original AI-Free Solution)

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Certain systems allow marked nulls. A marked null ?i is equal to itself, but if i ? j, then ?i ? ?j. One application of marked nulls is to allow certain updates through views. Consider the view loan-info (Section 3.5). Show how you can use marked nulls to allow the insertion of the tuple (?Johnson?, 1900) through loan info.