5/7 Correlated Subqueries I, Why use 'carrier' instead of another variable?

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5/7 Correlated Subqueries I

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Why do i have to use carrier = f.carrier as the filter variable? Is it because it might be a primary key? If that was the case wouldn’t ID work just as well?

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select id from flights as f where distance <
(select avg(distance) from flights
where carrier = f.carrier);

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