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Youareresponsibleformanagingthedatabaseschema&en
YouareresponsibleformanagingthedatabaseschemaforanorderentryapplicationinaSQLServer2005database.Afteradesignreview,amemberofthedevelopmentstaffasksyoutoaddanewcolumnnamedCommissionRatetotheProducttable.Becausetheactualcommissionratesforallproductsarenotknownatthistime,eachproducthasadefaultcommissionrateof12percent.Theratecanbemodifiedasnecessary.Youaddthenewcolumn.Youneedtoconfigurethetabletoassignthedefaultvalueasefficientlyaspossible.
Whatshouldyoudo?()
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现有:interfaceAnimal{voideat();}//insertcodeherepublicclassHouseCatextendsFeline{publicvoideat(){}}和五个申明abstractclassFelineimplementsAnimal{}abstractclassFelineimplementsAnimal{voideat();}abstractclassFelineimplementsAnimal{publicvoideat();}abstractclassFelineimplementsAnimal{publicvoideat(){}}abstractclassFelineimplementsAnimal{abstractpublicvoideat();}结果为:()
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