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Selectați descrierile corecte a clauzei GROUP BY

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Selectați descrierile corecte a clauzei GROUP BY

are ca efect gruparea tuplurilor unei relatii pe baza valorilor numai unui atribut

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are ca efect gruparea tuplurilor unei relatii pe baza valorilor unui atribut sau grup de atribute

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este obligatorie

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ea sa scrie dupa clauza WHERE sau dupa clauza FROM in cazul in care WHERE nu exista

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este obtionala

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