When null values exist in one of the columns in a simple condition,it is possible that those rows will not appear in the result of either the simple condition or its negation.

Question

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When a simple condition is applied to a column with null values, those rows with nulls will not satisfy the condition nor its negation, because null represents an unknown value and cannot be evaluated as true or false in a comparison.

When Null Values Exist in One of the Columns in a Simple