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select a.users,b.u_name
from (select GROUP_CONCAT(u_name) as users,p_id from webusers
GROUP BY p_id
) a
INNER JOIN webusers b
on a.p_id =b.u_id
select a.users,b.u_name
from (select GROUP_CONCAT(u_name) as users,p_id from webusers
GROUP BY p_id
) a
INNER JOIN webusers b
on a.p_id =b.u_id