A.create B.drop C.alter D.delete
A.WHERENAME!NULL B.WHERENAMENOTNULL C.WHERENAMEISNOTNULL D.WHERENAME!=NULL
A.插入數(shù)據(jù) B.查詢數(shù)據(jù) C.更新數(shù)據(jù) D.刪除數(shù)據(jù)