GROUP_CONCAT(c.mail ORDER BY c.id SEPARATOR "\\n") AS cmails,
GROUP_CONCAT(c.summary ORDER BY c.id SEPARATOR "\\n") AS csummaries,
GROUP_CONCAT(IFNULL(c.synchronized, 'NULL') ORDER BY c.id SEPARATOR "\\n") AS csynchronizeds
GROUP_CONCAT(c.mail ORDER BY c.id SEPARATOR "\\n") AS cmails,
GROUP_CONCAT(c.summary ORDER BY c.id SEPARATOR "\\n") AS csummaries,
GROUP_CONCAT(IFNULL(c.synchronized, 'NULL') ORDER BY c.id SEPARATOR "\\n") AS csynchronizeds