FAQ: Conditional Aggregates - SUM(CASE WHEN )

This community-built FAQ covers the “SUM(CASE WHEN )” exercise from the lesson “Conditional Aggregates”.

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This exercise can be found in the following Codecademy content:

SQL: Table Transformation

FAQs on the exercise SUM(CASE WHEN )

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I would like to have a row printed out only when the distance of the airline being worked with is not zero. I’ve tried:
FROM flights where sum>0
FROM flights where total_united_flight_distance>0
FROM flights where sum(CASE WHEN carrier = ‘UA’ THEN distance ELSE 0 END)>0

nothing is working.
any ideas?