Negation - sql, PL-SQL Programming

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Negation (NOT, ¬) - SQL

There are three rows instead of just two. As you can see, ¬ p is defined as in two-valued logic (2VL) when p is either true or false, but ¬ (unknown) is unknown.

858_Negation (NOT, ¬).png

Figure: The SQL Truth Table for Negation


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