Discussion
Each answer below shows example data from a table. Which answer is an example of the missing values problem?
Answer: C
Correct answer: Three rows have the values Brown, NULL, and Blue in the same column.
The missing values problem is the presence of nulls, and the difficulty is that a null is ambiguous: it may mean the value is unknown, or that it does not apply, or that nobody has entered it yet. Since the three call for different treatment and the data does not distinguish them, every null has to be investigated rather than assumed.
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