17.哪個陳述式會刪除未輸入員工電話號碼的資料列?(A)DELETEFROMEmployeeWHERE Phone IS NULL(B)DELETEFROMEmployeeWHEREPhone=NUL
問題詳情
17.哪個陳述式會刪除未輸入員工電話號碼的資料列? (A)DELETEFROMEmployeeWHERE Phone IS NULL (B)DELETEFROMEmployeeWHEREPhone=NULLABLE (C)DELETEFROMEmployeeWHEREPhone='&' (D)DELETEFROMEmployeeWHEREPhone IS NOTNULL