多项选择题
A.Only one LONG column can be used per table
B.A TIMESTAMP data type column stores only time values with fractional seconds
C.The BLOB data type column is used to store binary data in an operating system file
D.The minimum column width that can be specified for a VARCHAR2 data type column is one
E.The value for a CHAR data type column is blank-padded to the maximum defined column width
多项选择题 Whichtwostatementsaretrueregardingsubqueries?（）
多项选择题 Whichtwostatementsaretrueregardingsinglerowfunctions?（）
多项选择题 YouneedtogeneratealistofallcustomerlastnameswiththeircreditlimitsfromtheCUSTOMERStable.Thosecustomerswhodonothaveacreditlimitshouldappearlastinthelist.Whichtwoquerieswouldachievetherequiredresult?（）