SELECT round(AVG(TOTAL_VALUE))  AS SA_MEDIAN
FROM (SELECT TOTAL_VALUE
      FROM CONVENIENCE
      WHERE KIND_CODE = '100'
      and SURVEY_YEAR = '2019'
      ORDER BY TOTAL_VALUE
      LIMIT 2 - (SELECT COUNT(*) FROM CONVENIENCE
      WHERE KIND_CODE = '100'
      and SURVEY_YEAR = '2019') % 2  
      OFFSET (SELECT (COUNT(*) - 1) / 2
              FROM CONVENIENCE WHERE KIND_CODE = '100'
      and SURVEY_YEAR = '2019'))