8.哪一個陳述式的執行結果是建立索引？ (A)CREATE TABLE Employee {Employee IDINTEGER PRIMARYKEY} (B)CREATETABLEEmployee {EmployeeID INTEGER INDEX} (C)CREATETABLEEmployee {EmployeeIDINTEGER NULL} (D)CREATETABLEEmployee EmployeeIDINTEGER DISNNCT}