SELECT COUNT(*) FISH_COUNT
, FNI.FISH_NAME
FROM FISH_INFO FI
JOIN FISH_NAME_INFO FNI ON FI.FISH_TYPE = FNI.FISH_TYPE
GROUP BY FI.FISH_TYPE, FISH_NAME
ORDER BY FISH_COUNT DESC
문제에 '물고기 종류별~ ' 적혀있으니까 FISH_TYPE 컬럼만 고집해서 GROUP BY를 하려고 했거든요.. 그냥 제가 너무 문제 형식을 따라가려고만 한건가요 😵💫