Question: Find a SQL query that computes a set difference and returns false positive(s) over a database with null values. You may show the correctness of

Find a SQL query that computes a set difference and returns false positive(s) over a database with null values. You may show the correctness of your answer using an example.

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Find a SQL query that computes a set difference and returns false positive(s) over a database with null values. Show the correctness of your answer using an example.

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