Question: A. Find a SQL construct other than subquery, in, and not exists such that if it appears in a SQL query, the query may return

A. Find a SQL construct other than subquery, in, and not exists such that if it appears in a SQL query, the query may return false positive(s) or negative(s) over a database with null values. You may show the correctness of your answer using an example.

B. Find the largest subset of SQL queries whose members do not return any false positive over any database with null values.

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