Challenge: Relation between engine size and fuel consumption
Taak
Swipe to start coding
From the audi_cars
table calculate the average fuel consumption (mpg
column) for each engine size (enginesize
). Order results in descending order by the average value of mpg
. Expected output: enginesize | average mpg
.
Oplossing
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SELECT enginesize, AVG(mpg)
FROM audi_cars
GROUP BY enginesize
ORDER BY AVG(mpg) DESC
The result may seem strange, but don't forget that the
mpg
column refers to miles per gallon. The greater this value, the less fuel car consumes.
Was alles duidelijk?
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Sectie 6. Hoofdstuk 4
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