TestKing.comhasaSQLServer2005computer.Youhavebeenassignedthetaskofretrievinginformationaboutauserwhoiscurrentlyloggedin.Youneedtocreateafunctionthatreturnsscalarinformationabouttheactivitytimeforaparticularuser.Whataretwopossiblewaystoachievethisgoal？（）
A.Createafunctionthatreturnsalistofvaluesthatrepresentthelogintimesforthegivenuser.
B.Createafunctionthatreturnsalistofvaluesthatrepresentthepeoplewhohaveloggedmorehoursthanthecurrentuserhaslogged.
C.Createafunctionthatreturnsanumericvaluethatrepresentsthenumberofhoursthatauserhasloggedforthecurrentday.
D.Createafunctionthatreturnsanumericvaluethatrepresentsthenumberofhoursthatauserhasloggedforthecurrentmonth.
正确答案：参考C, D
