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Why are relational databases called so?

(Отметьте один правильный вариант ответа.)

Варианты ответа

Such databases "relate" built-in applications to the Web ones.

Such databases "relate" columns and rows to each other.

Such databases "relate" one table to another by means of keys.(Верный ответ)

Such databases "relate" text and figures to each other.

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