MySQL LEFT JOIN using MAX & GROUP BY on joined table?

Question

I\'ve got two tables (members and activities) and I\'m trying to query the members with the latest activity for each member. I\'ve got it working with two queries (one to get t

Answer 1

SELECT 
    members.id ,
    members.name,
    activities.code AS activity_code,
    activities.timestamp AS activity_timestamp,
    activities.description AS activity_description
FROM 
    members
    LEFT JOIN activities
        ON members.id = activities.member_id
    LEFT JOIN 
        (
            SELECT
                activities.member_id
                MAX(activities.id) AS id
            FROM activities
            GROUP BY 
                activities.member_id
        ) AS t1
        ON activities.id = t1.id
WHERE
    t1.id IS NOT NULL