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with tb as (select '103453689f' as c1, '10345468' as c2 from dual) ,res1 as ( SELECT REGEXP_SUBSTR (c1, '.{1}', 1, level) AS v1, level as lv1 FROM tb CONNECT BY REGEXP_SUBSTR (c1, '.{1}', 1, level) IS NOT NULL ) ,res2 as ( SELECT REGEXP_SUBSTR (c2, '.{1}', 1, level) AS v2, level as lv2 FROM tb CONNECT BY REGEXP_SUBSTR (c2, '.{1}', 1, level) IS NOT NULL ) select lv1 as lv from res1 union select lv2 as lv from res2

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