現在需要給表myrecord的vc_period欄位新增資料（表格建立、資料插入語句在文末附上），新增前後的情況如圖所示：

編寫儲存過程，程式碼如下：

這裡的儲存過程執行一次就完了的那種，還有一種是會寫入oracle資料庫的。（想嘗試儲存過程不同寫法，可以參看[oracle儲存過程]將給定資料與已有的資料做比較）

declare
  n_lid number; --主鍵id
  n_projectId number;
  n_companyId number;
  group_count number; --當前組擁有的記錄條數
  my_counter number; --計數器
  --將各個分組的情況存放在遊標中
  cursor data_cur is
     select l_project_id, l_company_id, count(*) from myrecord group by l_project_id, l_company_id order by l_project_id, l_company_id;
begin
  open data_cur;
  fetch data_cur into n_projectId, n_companyId, group_count;
  loop
    exit when not data_cur%found;
    my_counter:=1;
    --通過迴圈給各組資料進行編號
    for cr in (select l_id, l_project_Id, l_company_id from myrecord where l_project_id = n_projectId and l_company_id = n_companyId order by l_project_id, l_company_id) loop
      update myrecord set vc_period = my_counter where l_id = cr.l_id;
      dbms_output.put_line('主鍵id：'||cr.l_id||'====當前計數：'||my_counter);
      my_counter := my_counter + 1;
      --如果計數已經超過了該組的記錄條數，說明該組的編號操作已完成
      if my_counter > group_count then
        exit;
      end if;
    end loop; --結束迴圈
    commit;--如果每組中的資料比較多的話，可以在迴圈完每組後做一次提交；資料少的話，可以在關閉遊標後，一次性全部提交
    fetch data_cur into n_projectId, n_companyId, group_count;--繼續從遊標中取資料
   end loop;
  close data_cur;
end;
 

恢復到新增前的狀態：

update myrecord set vc_period = null;
commit;

參考連結：

附註（表格建立、資料插入語句）：

-- Create table
create table MYRECORD
(
  l_id         NUMBER,
  l_project_id NUMBER,
  l_company_id NUMBER,
  vc_period    VARCHAR2(20)
);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (1, 101, 1501, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (2, 101, 1501, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (3, 101, 1501, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (4, 101, 1502, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (5, 101, 1502, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (6, 101, 1502, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (7, 101, 1502, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (8, 102, 1501, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (9, 102, 1501, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (10, 102, 1502, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (11, 102, 1503, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (12, 102, 1503, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (13, 102, 1504, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (14, 103, 1505, null);

insert into myrecord (L_ID, L_PROJECT_ID, L_COMPANY_ID, VC_PERIOD)
values (15, 103, 1506, null);