●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 (73) ．(73) A．1NFB．2NFC．3NFD．BCNF
●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 (73) ．
(73) A．1NF
B．2NF
C．3NF
D．BCNF
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