SELECT tag.name, tag.id FROM #__k2_tags as tag INNER JOIN #__k2_tags_xref tags_xref ON tags_xref.tagID = tag.id RIGHT JOIN #__k2_items as i ON tags_xref.itemID = i.id  RIGHT JOIN #__k2_categories c ON c.id = i.catid WHERE i.published = 1 AND i.access IN(1,1,5) AND i.trash = 0 AND c.published = 1 AND c.access IN(1,1,5)  AND c.trash = 0 AND ( i.publish_up = '0000-00-00 00:00:00' OR i.publish_up <= '2024-12-27 01:59:13' ) AND ( i.publish_down = '0000-00-00 00:00:00' OR i.publish_down >= '2024-12-27 01:59:13' ) AND i.catid=4 GROUP BY tag.id

Array
(
    [0] => stdClass Object
        (
            [name] => Eκπαίδευση
            [id] => 1
        )

    [1] => stdClass Object
        (
            [name] => Ψυχολογία
            [id] => 2
        )

    [2] => stdClass Object
        (
            [name] => Με άλλη ματιά
            [id] => 4
        )

    [3] => stdClass Object
        (
            [name] => Άρθρα
            [id] => 5
        )

    [4] => stdClass Object
        (
            [name] => My brainy
            [id] => 7
        )

)