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

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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