Намерете диапазони от поредица от числа в SQL/Oracle

Можете да го направите, като използвате ROW_NUMBER аналитична функция. Вижте Намиране на диапазон от последователни стойности в поредица от числа или дати .

Например

Диапазон

SQL> with data(num) as(
  2      select  1 from dual union
  3      select  2 from dual union
  4      select  3 from dual union
  5      select  5 from dual union
  6      select  6 from dual union
  7      select  7 from dual union
  8      select 10 from dual union
  9      select 11 from dual union
 10      select 12 from dual union
 11      select 20 from dual
 12  )
 13  select min(num)||'-'|| max(num) as "range"
 14  from (select num,
 15           num-Row_Number() over(order by num)
 16           as rn
 17           from data)
 18  group by rn
 19  order by min(num);

range
-------------------------------------------------
1-3
5-7
10-12
20-20

SQL>

Списък

SQL> with data(num) as(
  2      select  1 from dual union
  3      select  2 from dual union
  4      select  3 from dual union
  5      select  5 from dual union
  6      select  6 from dual union
  7      select  7 from dual union
  8      select 10 from dual union
  9      select 11 from dual union
 10      select 12 from dual union
 11      select 20 from dual
 12  )
 13  SELECT listagg(range, ',') WITHIN GROUP(
 14  ORDER BY min_num) AS "list"
 15  FROM
 16    (SELECT MIN(num) min_num,
 17      MIN(num)
 18      ||'-'
 19      || MAX(num) range
 20    FROM
 21      (SELECT num, num-Row_Number() over(order by num) AS rn FROM DATA
 22      )
 23    GROUP BY rn
 24    );

list
-------------------------------------------------------------------------
1-3,5-7,10-12,20-20

SQL>

Актуализация OP иска решение в PL/SQL за съхраняване на списъка в PL/SQL променлива.

Настройка

SQL> CREATE TABLE t AS
  2  SELECT *
  3  FROM
  4    ( WITH data(num) AS
  5    ( SELECT 1 FROM dual
  6    UNION
  7    SELECT 2 FROM dual
  8    UNION
  9    SELECT 3 FROM dual
 10    UNION
 11    SELECT 5 FROM dual
 12    UNION
 13    SELECT 6 FROM dual
 14    UNION
 15    SELECT 7 FROM dual
 16    UNION
 17    SELECT 10 FROM dual
 18    UNION
 19    SELECT 11 FROM dual
 20    UNION
 21    SELECT 12 FROM dual
 22    UNION
 23    SELECT 20 FROM dual
 24    )
 25  SELECT * FROM DATA);

Table created.

PL/SQL блок

SQL> SET SERVEROUTPUT ON
SQL> DECLARE
  2    v_list VARCHAR2(100);
  3  BEGIN
  4    SELECT listagg(RANGE, ',') WITHIN GROUP(
  5    ORDER BY min_num)
  6    INTO v_list
  7    FROM
  8      (SELECT MIN(num) min_num,
  9        MIN(num)
 10        ||'-'
 11        || MAX(num) range
 12      FROM
 13        (SELECT num, num-Row_Number() over(order by num) AS rn FROM t
 14        )
 15      GROUP BY rn
 16      );
 17    dbms_output.put_line(v_list);
 18  END;
 19  /
1-3,5-7,10-12,20-20

PL/SQL procedure successfully completed.

SQL>