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?????? ??. ??. ??. ??. ??. ?? ?? ?? (DATA). ??? ??? ???(Entity Relational Diagram). ??? ?????? ??. ??? ?????? ??. ?????? ??. ??. 1) ?? ???? ??2) ??? ?? (?? ???? ??? ?? ???)3) ???? ??(???? ? ??? ????). ??. 1) ??? ??? ?? ? ??? ??? ???? DATA ??2) ??? ??? ??? ? ERD ??. . ??. 1) ERD? ???? ??? ???

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