FAQ: Subqueries - Non-Correlated Subqueries II


This community-built FAQ covers the “Non-Correlated Subqueries II” exercise from the lesson “Subqueries”.

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This exercise can be found in the following Codecademy content:

SQL: Table Transformation

FAQs on the exercise Non-Correlated Subqueries II

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How is the airports table connected to the flights table?

SELECT * FROM flights
WHERE origin in (
	SELECT code FROM airports
  WHERE faa_region = 'ASO'

In this example, we use code to associate the flight with the airport.
Why does this code work only with code column and not other columns for example id?

I am trying to understand how is the relationship formed between the two tables


I have the exact same question. I’m not sure how returning a “code” in the filter for the airports table links up with an “origin” from the flights table. Any feedback would be much appreciated.

thank you


Guys, there is no relationship between two tables as it said in the chapter’s description:

A non-correlated subquery is a subquery that can be run independently of the outer query and as we saw, can be used to complete a multi-step transformation.

The subquery just gives us a list with appropriate codes which then are being processed by IN statement.

The field flights.origin contains the same data as airports.code because they both probably get it from the third table that contains airport codes.


Ok, so if the text in flights.origin and airports.code is the same, I am no longer confused lol. Is that what we’re getting at?

thanks for replying!!


But then shouldn’t it mentioned in the course? It’s very confusing.


I had the same question. But if airports.code and flights.origin have the same data, can’t be this done with a join?