Базы данных: конспект лекций. Коллектив авторов

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Базы данных: конспект лекций - Коллектив авторов

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произведения двух отношений и унарной операции выборки.

      6. Выражения реляционной алгебры

      Покажем, как можно использовать рассмотренные ранее выражения и операции реляционной алгебры в практической эксплуатации различных баз данных.

      Конец ознакомительного фрагмента.

      Текст предоставлен ООО «ЛитРес».

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      Примечания

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