आपको rel_destinations . के साथ एक अलग जुड़ाव का उपयोग करने की आवश्यकता है एक गंतव्य के रूप में प्राग के साथ ऑफ़र प्राप्त करने के लिए। अपनी मूल क्वेरी के साथ इसमें शामिल हों।
SELECT offers.*,
GROUP_CONCAT(DISTINCT DEPC.name SEPARATOR ', ') AS depCities,
GROUP_CONCAT(DISTINCT DESTC.name SEPARATOR ', ') AS destCities
FROM offers
INNER JOIN `rel_departments` ON (`rel_departments`.`offer_id` = `offers`.`id`)
INNER JOIN `departments` as DEPC ON (DEPC.`id` = `rel_departments`.`rel_id`)
INNER JOIN `rel_destinations` ON (`rel_destinations`.`offer_id` = `offers`.`id`)
INNER JOIN `destinations` as DESTC ON (DESTC.`id` = `rel_destinations`.`rel_id`)
INNER JOIN rel_destinations AS d1 ON d1.offer_id = offers.id
WHERE d1.rel_id = 1
GROUP BY offers.id
