[SQL문제풀기] 노선별 평균 역 사이 거리 조회하기

문제

내가 작성한 오답

SELECT ROUTE
        ,CONCAT(ROUND(SUM(D_BETWEEN_DIST),1),'km') TOTAL_DISTANCE
        ,CONCAT(ROUND(AVG(D_BETWEEN_DIST),2),'km') AVERAGE_DISTANCE
FROM SUBWAY_DISTANCE
GROUP BY ROUTE
ORDER BY TOTAL_DISTANCE DESC

오답의 원인

내가 작성한 정답

SELECT ROUTE
        ,CONCAT(ROUND(SUM(D_BETWEEN_DIST),1),'km') TOTAL_DISTANCE
        ,CONCAT(ROUND(AVG(D_BETWEEN_DIST),2),'km') AVERAGE_DISTANCE
FROM SUBWAY_DISTANCE
GROUP BY ROUTE
ORDER BY SUM(D_BETWEEN_DIST) DESC