SELECT master_brand.code AS brand_code, master_brand.name AS brand_name, master_body.name AS body_name, model, COUNT(1) AS cnt
FROM usedcar raw
JOIN
( SELECT code, name, country_name FROM brand_master ) master_brand
ON
raw.code = master_brand.code
JOIN
( SELECT code, name FROM body_master ) master_body
ON
raw.body_code = master_body.code
WHERE master_brand.name = 'ポルシェ' AND master_body.name = 'オープン'
GROUP BY master_brand.code, master_brand.name, master_body.name, model
ORDER BY model