A.INPUT TO X B.WAIT TO X C.ACCEPT TO X D.以上均可
A.GROUP BY B.FROM C.OREDR BY D.WHERE
A.在表文件開始增加一條空記錄 B.在表文件末尾增加一條空記錄 C.在當(dāng)前記錄前增加一條空記錄 D.在當(dāng)前記錄后增加一條空記錄