(CASE WHEN price/cost >= 1.7 THEN 'A. 고효율 메뉴' WHEN price/cost < 1.7 AND price/cost >= 1.5 THEN 'B. 중효율 메뉴' WHEN price/cost < 1.5 AND price/cost >= 1 THEN 'C. 저효율 메뉴' END) AS efficiency
FROM pizza_price_cost ORDER BY efficiency DESC, price ASC LIMIT 6;
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