SELECT
    SUBSTR(LOGIN_DATETIME, 1, 10) AS FIRST_LOGIN
    , COUNT(*) AS MEMBER_CNT
FROM
    ACCESS_LOG 
WHERE
    (MEMBER_CODE, LOGIN_DATETIME) IN (
        SELECT
            MEMBER_CODE,
            MIN(LOGIN_DATETIME)
        FROM
            ACCESS_LOG
        WHERE
            LOGIN_DATETIME >= '2023-08-01' AND LOGIN_DATETIME <= '2023-08-31'
        GROUP BY
            MEMBER_CODE
    )
GROUP BY 
    SUBSTR(LOGIN_DATETIME, 1, 10)
ORDER BY
    FIRST_LOGIN DESC;