missing numbers script wont work? [duplicate]

问题

This script will get the sequence,year,month and day from the following string... then find the missing number from the sequence part like (1111,1112,115,.. etc) the problem is that the output of this script are not correct does not DBMS the missing numbers

emp-1111_14_01_01_2141_G1

emp-1112_14_01_01_1612_G1

emp-1115_14_01_01_1109_G1

emp-1116_14_01_01_1315_G1

emp-1118_14_01_01_0910_G2

emp-1121_14_01_01_1105_G1

emp-1111_14_01_01_1120_G2

The output result should be like this

Missing number 1113

Missing number 1114

Missing number 1117

Missing number 1118

Missing number 1119

Missing number 1120

declare 
  v_name          table1.ENAME%TYPE;
  V_seq           NUMBER (4);
  V_Year          number(2);
  V_Month         number (2);
  V_day           number (2);
  max_seq         number(4);
  min_seq         number(4);

  CURSOR List_ENAME_cur IS
  SELECT ENAME from table1
  WHERE status = 2;
begin 

  FOR List_ENAME_rec IN List_ENAME_cur loop
    if REGEXP_LIKE(List_ENAME_cur.ENAME,'emp[-][1-9]{4}[_][1-9]{2}[_][1-9]{2}[_][1-9]{2}[_][0-9]{4}[_][G]["1"]') then 
      V_seq := substr(List_ENAME_cur.ename,5,4);
      V_Year := substr(List_ENAME_cur.ename,10,2);
      V_Month := substr(List_ENAME_cur.ename,13,2);
      V_day := substr(List_ENAME_cur.ename,16,2);


      if min_seq is null or V_seq_FILENAME < min_seq then
        min_seq := V_seq_FILENAME;
        DBMS_OUTPUT.PUT_LINE('Missing number '||min_seq );
      end if;

      if max_seq is null or V_seq_FILENAME > max_seq then
        max_seq := V_seq_FILENAME;
        DBMS_OUTPUT.PUT_LINE('Missing number '||max_seq );
      end if;

    end if;
  end loop;    
  DBMS_OUTPUT.PUT_LINE('max_seq '||max_seq||' min_seq '||min_seq);    
end;

回答1:

See this example

WITH ORDH
     AS (SELECT 1111 AS ORDERNO FROM DUAL
         UNION ALL
         SELECT 1112 AS ORDERNO FROM DUAL
         UNION ALL
         SELECT 1115 AS ORDERNO FROM DUAL
         UNION ALL
         SELECT 1116 AS ORDERNO FROM DUAL
         UNION ALL
         SELECT 1118 AS ORDERNO FROM DUAL
         UNION ALL
         SELECT 1121 AS ORDERNO FROM DUAL),
     GOT_NEXT_ORDERNO
     AS (SELECT ORDERNO,
                LEAD ( ORDERNO ) OVER (ORDER BY ORDERNO) AS NEXT_ORDERNO
         FROM   ORDH)
SELECT ORDERNO + 1 AS FROM_NO, NEXT_ORDERNO - 1 AS TO_NO
FROM   GOT_NEXT_ORDERNO
WHERE  ORDERNO + 1 <> NEXT_ORDERNO;

   FROM_NO      TO_NO
---------- ----------
      1113       1114
      1117       1117
      1119       1120

3 rows selected.

来源：https://stackoverflow.com/questions/21900092/missing-numbers-script-wont-work

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Oracle

oracle11g