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What are null values, and why are they a problem?
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Database Processing: Fundamentals, Design, and Implementation
Edition: 15th
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A week ago
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A null value is a missing value, a value that has never been input into a cell in a table. Null values are a problem because they are ambiguous. A null value can represent three different conditions: (1) the value is inappropriate, (2) the value is appropriate but unknown, or (3) the value is appropriate and known but not entered into the database.
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