Which of the following aggregate functions does not ignore null values -Options: Pick one correct answer from belowMax(attribute)Count(attribute)Min(attribute)Count(*)Both ii) and iv)Both i) and iii)
Question
Which of the following aggregate functions does not ignore null values -Options: Pick one correct answer from belowMax(attribute)Count(attribute)Min(attribute)Count(*)Both ii) and iv)Both i) and iii)
Solution
The correct answer is Both ii) and iv).
Here's why:
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Max(attribute): This function ignores null values. It returns the maximum value in the attribute column.
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Count(attribute): This function does not ignore null values. It counts the number of non-null values in the attribute column.
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Min(attribute): This function also ignores null values. It returns the minimum value in the attribute column.
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Count(*): This function does not ignore null values. It counts all rows, regardless of whether they contain null values or not.
So, both Count(attribute) and Count(*) do not ignore null values.
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