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WITH t(code) AS ( SELECT '000001234567' FROM dual UNION ALL SELECT '1234567' FROM dual UNION ALL SELECT '000002345678' FROM dual UNION ALL SELECT '2345678' FROM dual UNION ALL SELECT '000003456789' FROM dual UNION ALL SELECT '000004567891' FROM dual UNION ALL SELECT '000005678912' FROM dual ) SELECT CONCAT('00000',TRIM(LEADING '0' FROM code)) AS result FROM t GROUP BY CONCAT('00000',TRIM(LEADING '0' FROM code)) HAVING COUNT(TRIM(LEADING '0' FROM code))=1
result
000003456789
000004567891
000005678912