SELECT
    STRFTIME('%Y-%m',SALES_DATE) AS YEAR_MONTH,
    SUM(SALES_AMT) AS MONTH_AMT
FROM
    SALES
WHERE
    UPDATED_NO IS NULL
    AND SALES_DATE BETWEEN '2023-01-01' AND '2023-12-31'
GROUP BY
    STRFTIME('%Y-%m',SALES_DATE)
    ;