문제
풀이
ORDER BY 를 할 때, CONCAT을 진행한 상태인 TOTAL_DISTANCE를 기준으로 정렬을 하게 되면 정렬이 제대로 되지 않는다고 한다.
SELECT ROUTE,
CONCAT(ROUND(SUM(D_BETWEEN_DIST), 1), 'km') AS TOTAL_DISTANCE,
CONCAT(ROUND(AVG(D_BETWEEN_DIST), 2), 'km') AS AVERAGE_DISTANCE
FROM SUBWAY_DISTANCE
GROUP BY ROUTE
ORDER BY ROUND(SUM(D_BETWEEN_DIST), 1) DESC;
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