About: Tuple relational calculus

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Calculus that was introduced by Edgar F. Codd

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dbo:description	calculus that was introduced by Edgar F. Codd (en)
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rdfs:label	Tuple relational calculus (en) Cálculo relacional basado en tuplas (es) Исчисление кортежей (ru) 元组关系演算 (zh)
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