SELECT ROUND(AVG(TOTAL_VALUE)) 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'
                ))