Youneedtocreateacolumnthatallowsyoutocreateauniqueconstraint.Whichtwo column definitionsshouldyou choose?() A.nvarchar（100）NULL B.nvarchar（max）NOTNULL C.nvarchar（100）NOTNULL D.nvarchar（100）SPARSENULL
Youneedtocreateacolumnthatallowsyoutocreateauniqueconstraint.Whichtwo column definitionsshouldyou choose?() A.nvarchar（100）NULL B.nvarchar（max）NOTNULL C.nvarchar（100）NOTNULL D.nvarchar（100）SPARSENULL
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