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SELECT u.ID as uid, u.display_name, cast(m4.meta_value as datetime) as last_activity, 99999 as distance, CASE WHEN u.display_name LIKE '% %' THEN right(u.display_name, length(u.display_name)-locate(' ', u.display_name)) ELSE u.display_name END AS surname FROM wp_users u LEFT JOIN wp_usermeta m4 ON u.ID = m4.user_id WHERE m4.meta_key = 'symposium_last_activity' AND (u.display_name IS NOT NULL) AND ( (lower(u.display_name) LIKE 'r%') ) ORDER BY cast(m4.meta_value as datetime) DESC LIMIT 0,1000