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