SELECT ROUND(AVG(TOTAL_VALUE), 0) AS SA_MEDIAN
FROM (SELECT TOTAL_VALUE
      FROM CONVENIENCE
      WHERE SURVEY_YEAR = 2019
        AND KIND_CODE = '100'
      ORDER BY TOTAL_VALUE
      LIMIT 2 - (SELECT COUNT(*) FROM CONVENIENCE WHERE SURVEY_YEAR = 2019 AND KIND_CODE = '100') % 2    -- odd 1, even 2
      OFFSET (SELECT (COUNT(*) - 1) / 2
              FROM CONVENIENCE WHERE SURVEY_YEAR = 2019 AND KIND_CODE = '100'))