单选

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).

  • A.1NF
  • B.2NF
  • C.3NF
  • D.BCNFThe construct    eobegin    Statement1;    Statement2;    coend    means Statement1 and Statement2 are to be executed in parallel. The only two atomic actions in this construct are loading the value of a variable and storing into a variable. For the
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