题目内容：
Suppose we have the relation schema R(A，B，C，D)with functional dependencies；F{A→B，B→C，C→D，D→A}，then R(A，B，C，D.at least is in .
参考答案：
答案解析：
单选题：Suppose we have the relation schema R(A，B，C，D)with functiona
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