A.確定各屬性間的函數(shù)依賴關(guān)系B.判斷每個(gè)關(guān)系模式的范式,根據(jù)實(shí)際需要確定最合適的范式C.確立適當(dāng)?shù)乃饕?/p>
A.pmonB.crsd.binC.ocssd.binD.smon
A.substrB.COVERTC.to_dateD.to_char