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jtbh(¼ÒÍ¥±àºÅ) hzxm(»§Ö÷ÐÕÃû) hnbh(»§ÄÚ×î´ó±àºÅ) 
1000          ÕÅÈý            03
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grbh£¨¸öÈ˱àºÅ=¼ÒÍ¥±àºÅ+2λ»§ÄÚ±àºÅ) xm(ÐÕÃû) gz(¹¤×Ê)
100001                          ÕÅÈý      1000
100002                          ÀîËÄ      1000
100003                          ÍõÎå      1000
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CREATE PROCEDURE update_for_csdner();
  CURSOR v_cursor IS SELECT MAX(substr(grbh, 4, 2)) hnbh, substr(grbh, 0, 4) jtbh from b GROUP BY substr(grbh, 0, 4);
  v_jtbh VARCHAR2(4);
  v_hnbh VARCHAR2(2);
BEGIN
  OPEN v_cursor;
  LOOP
    FETCH v_cursor INTO v_hnbh, v_jtbh;
    EXIT WHEN v_cursor%NOTFOUND;
    UPDATE A SET hnbh = v_hnbh WHERE jtbh = v_jtbh;
    COMMIT;
  END LOOP;
  CLOSE v_cursor;
END;


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