このクエリでは、返したい車のモデルを指定します (ハードコーディング)。したがって、以下の SQL はモデルごとに1 つのレコードを返します。
SELECT
*
FROM
main
WHERE
(
(marka_name = 'SUBARU' AND model_name = 'IMPREZA' AND (kuzov = 'GC8' OR kuzov = 'GF8')) OR
(marka_name = 'MAZDA' AND model_name = 'RX-7' AND kuzov = 'FD3S') OR
(marka_name = 'MITSUBISHI' AND model_name = 'LANCER' AND (kuzov = 'CN9A' OR kuzov = 'CP9A')) OR
(marka_name = 'NISSAN' AND model_name = 'SKYLINE' AND (kuzov = 'ER34' OR kuzov = 'BCNR33')) OR
(marka_name = 'NISSAN' AND model_name = 'SILVIA' AND kuzov = 'S14') OR
(marka_name = 'TOYOTA' AND model_name = 'CELICA' AND kuzov = 'ST205') OR
(marka_name = 'TOYOTA' AND model_name = 'ARISTO' AND kuzov = 'JZS161') OR
(marka_name = 'MITSUBISHI' AND model_name = 'DELICA' AND (kuzov = 'PE8W' OR kuzov = 'PD8W' OR kuzov = 'PF8W'))
)
AND
(rate != 'RA' AND rate != 'RR' AND rate != 'A1' AND rate != 'A' AND rate != 'R' AND rate >= '3')
AND
(mileage >= 0 AND mileage <= 150000)
AND
(year >= 1990 AND year <= 1998)
GROUP BY
model_name
ORDER BY
mileage ASC,
rate DESC
ユニオンなしで、この SQL がフィールドで指定された複数のモデルを返すようにすることが可能になりました。例：
GROUP BY
model_name
HAVING COUNT(model_name) = 2
ORDER BY
mileage ASC,
rate DESC
HAVING COUNT が意味をなさないことはわかっていますが、モデルごとに返される車の数を指定する方法が必要です。