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SQL & Tuple Relational Calculus

SQL & Tuple Relational Calculus. Nulls. Conditions: x op y (where op is <, >, <>, =, etc.) has value unknown ( U ) when either x or y is null WHERE T.cost > T.price Arithmetic expression: x op y (where op is +, -, *, etc.) has value NULL if x or y is null

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SQL &amp; Tuple Relational Calculus

SQL & Tuple Relational Calculus