Three-Valued Logic
A logical system used in SQL databases that extends traditional two-valued logic (TRUE/FALSE) with an additional UNKNOWN state, used to handle comparison operations involving NULL values.
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Ternary uses the three digits 0, 1, and 2, and each digit position can carry three states; compared with the two-state encoding of binary, it is naturally suited to expressing three-valued logic such as "yes/no/undetermined" or "positive/negative/neutral".
In SQL's three-valued logic, the result of any comparison operation involving NULL is UNKNOWN, rather than TRUE or FALSE.
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Ternary uses the three digits 0, 1, and 2, and each digit position can carry three states; compared with the two-state encoding of binary, it is naturally suited to expressing three-valued logic such as "yes/no/undetermined" or "positive/negative/neutral".
50%UnverifiedIn SQL's three-valued logic, the result of any comparison operation involving NULL is UNKNOWN, rather than TRUE or FALSE.
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