การนัดหมายครั้งถัดไป

SELECT
    m.personal_info:name.first AS first_name,
    m.personal_info:name.last AS last_name,
    v.gym_id,
    v.checkin_time AS last_appointment,
	
    -- Propose a next appointment in one week
    ___(___, ___, ___) AS ___,
    
    -- Propose a next appointment in two weeks
    ___ AS in_2_weeks,
    
    -- Propose a next appointment in one month
    ___

FROM CORE_GYM.visits AS v
JOIN CORE_GYM.members AS m
    ON v.user_id = m.user_id;