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Hey, I need a little help with this exercise. I need to find the average total distance flown by day of week and month by using sub queries. But it says that my code is wrong.
select a.dep_month,
a.dep_day_of_week,
AVG(a.flight_distance) as average_distance
FROM (
SELECT dep_month,
dep_day_of_week,
dep_date,
COUNT(*) AS flight_distance
FROM flights
GROUP BY 1,2,3
) a
GROUP BY 1,2
ORDER BY 1,2;
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