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Opérateurs booléens:Opérateurs ___________ utiliser pour rendre les recherches dans les bases de données plus efficace.3 opérateur principaux:-________: opérateur d'intersection qui sélectionne les enregistrements qui présente simultanément un ensemble de caractéristiques spécifiques-____:opérateur d'union qui sélectionne les enregistrements qui présente au moins une caractéristique parmi un ensemble de caractéristiques possibles.- _____: opérateur d'EXCLUSION(enregistrement ps intéressant)
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