--步驟一：導出分數表的數據
exp newdream/dream1234@tm file=c:\t56\score.dmp tables=(score);
--步驟二：刪除表
drop table score;
select * from score;
--步驟三：將步驟一導出的表還原
imp newdream/dream1234@tm file=c:\t56\score.dmp tables=(score);
--步驟四：只刪除數據，再次導入。如果表已經存在不允許導入
delete from score;
imp newdream/dream1234@tm file=c:\t56\score.dmp tables=(score);
imp newdream/dream1234@tm file=c:\t56\score.dmp tables=(score) ignore=y
