Oracle 根据序列已有最大值自动生成累加序列

CREATE OR REPLACE Procedure Test As  v_Sn Integer;Begin  Select Max(Sn) Into v_Sn From Postcard_Print;  For i In (Select Rowid Row_Id From Postcard_Print Where Sn Is Null) Loop    v_Sn := v_Sn + 1;    Update Postcard_Print Set Sn = v_Sn Where Rowid = i.Row_Id;  Commit;  End Loop;  Commit;End;

?说明：

?????? Postcard_Print为需要加入序列的表名；

?????? v_Sn为设置的累加变量；

?????? Sn为序列的字段；