Question

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.

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  • CreatedJanuary 28, 2011
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