SELECT
    ROUND(AVG(WORK.TOTAL_VALUE)) AS SA_MEDIAN
FROM
    (
        SELECT
            *,
            ROW_NUMBER() OVER (
                PARTITION BY SURVEY_YEAR
                ORDER BY
                    TOTAL_VALUE
            ) AS ROWNUM,
            COUNT(1) OVER(PARTITION BY SURVEY_YEAR) AS TOTAL_SURVEY
        FROM
            CONVENIENCE
        WHERE
            KIND_CODE = 100
    ) WORK
WHERE
    WORK.ROWNUM BETWEEN WORK.TOTAL_SURVEY * 1.0 / 2
    AND WORK.TOTAL_SURVEY * 1.0 / 2 + 1
    and WORK.SURVEY_YEAR = '2019'