SQL> select rownum 行号,e.* from e;     行号 AAA                        BBB       CCC
--------- -------------------- --------- ---------
        1 101                          1
        2 102                          2        22
        3 103                          3
        4 103                         43
        5 102                          5        55
        6 aaa                          6         6
        7 AAA                          7         7
        8 1                            1         1
        9 bbb                          1         1已选择9行。