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YouneedtogeneratealistofallcustomerlastnameswiththeircreditlimitsfromtheCUSTOMERStable.Thosecustomerswhodonothaveacreditlimitshouldappearlastinthelist.Whichtwoquerieswouldachievetherequiredresult?()A.SELECTcust_last_name,cust_credit_limitFROMcustomersORDE
题目
YouneedtogeneratealistofallcustomerlastnameswiththeircreditlimitsfromtheCUSTOMERStable.Thosecustomerswhodonothaveacreditlimitshouldappearlastinthelist.Whichtwoquerieswouldachievetherequiredresult?()
A.SELECTcust_last_name,cust_credit_limitFROMcustomersORDERBYcust_credit_limitDESC
B.SELECTcust_last_name,cust_credit_limitFROMcustomersORDERBYcust_credit_limit
C.SELECTcust_last_name,cust_credit_limitFROMcustomersORDERBYcust_credit_limitNULLSLAST
D.SELECTcust_last_name,cust_credit_limitFROMcustomersORDERBYcust_last_name,cust_credit_limitNULLSLAST
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参考答案和解析
参考答案：B, C