Các phát biểu nào dưới đây sai:

A. Trong một quan hệ có thể có nhiều khóa chính

B. Mối liên kết giữa các quan hệ được xác lập trên thuộc tính khóa

C. Khóa chính xác định trong một quan hệ không có hai hàng giống hệt nhau

D. Hai quan hệ có các thuộc tính với tên giống nhau mới xác lập được liên kết

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