可以通过函数SCN_TO_TIMESTAMP（10g以后）将其转换回timestamp：

select dbms_flashback.get_system_change_number, SCN_TO_TIMESTAMP(dbms_flashback.get_system_change_number) from dual;

也可以用函数timestamp_to_scn将一个timestamp转换为SCN：

select timestamp_to_scn(SYSTIMESTAMP) as scn from dual;

如果你想把DATE类型转换成TIMESTAMP类型，就使用CAST函数。

select cast(sysdate as timestamp) from dual;

--恢复到几分钟前
select t.*, t.rowid from ar_mid_acap as of timestamp sysdate - 5 / 1440 t;

--恢复到具体的某个时间点
select *
  from ar_mid_acap as of scn timestamp_to_scn(To_Date('2012-4-25', 'yyyy-mm-dd hh24:mi:ss'));

--两个时间点间的变化信息
select v_id, va, versions_startscn, versions_endscn, versions_operation
  from t_fb_test versions between scn 12372466 and 12372538
 order by 1;

--恢复语句undo
select xid, commit_scn, commit_timestamp, operation, undo_sql
  from flashback_transaction_query q
 where q.xid in
       (select versions_xid
          from t_fb_test versions between scn 23413946 and 23413959);

--恢复表
 FLASHBACK TABLE goodsinfo1 TO BEFORE DROP;

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