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Logical Operators

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The following logical operators are available: AND, OR and NOT. SQL uses a three-valued logic system with true, false and NULL. Note that logical operators involving NULL do not always evaluate to NULL. For example, NULL AND false will evaluate to false, and NULL OR true will evaluate to true. Below are the complete truth tables. Binary Operators: AND and OR a b a AND b a OR b true true true true true false false tr…

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