WITH g AS (
	SELECT
		l.id AS l,
		r.id AS r,
		r.group_rate,
		r.rarity
	FROM skill_data l
		JOIN skill_data r ON l.group_id = r.group_id
	
	UNION ALL

	SELECT
		s.id AS l,
		i.id AS r,
		i.group_rate,
		i.rarity
	FROM skill_data s
		JOIN skill_data i ON s.id IN (i.unique_skill_id_1, i.unique_skill_id_2)
	
	UNION ALL

	SELECT
		s.id AS l,
		i.id AS r,
		i.group_rate,
		i.rarity
	FROM skill_data s
		JOIN skill_data i ON i.id IN (s.unique_skill_id_1, s.unique_skill_id_2)

	UNION ALL

	SELECT
		l.id AS l,
		r.id AS r,
		r.group_rate,
		r.rarity
	FROM skill_data i
		JOIN skill_data l ON l.id IN (i.unique_skill_id_1, i.unique_skill_id_2)
		JOIN skill_data r ON r.id IN (i.unique_skill_id_1, i.unique_skill_id_2)
	WHERE l.id != r.id
)
SELECT * FROM g
ORDER BY l, group_rate, rarity DESC