Non-Correlated Subqueries II

#1

Hi!

Can someone explain why ‘origin’ and ‘code’ are used in Subquerriey II? I understand subquerries when it involves a < or = sign after the WHERE, but I am not sure what this code exactly does…

Thanks in advance!

SELECT *
FROM flights
WHERE origin in (
	SELECT code
	FROM airports
	WHERE faa_region = 'ASO'
);
#2

Hi!

As I understand it, the subquery that is inside the brackets creates a list of codes from the table airports, where the code is in the faa_region ASO. The outer query then returns all flights if their origin is among the list of the codes that the subquery created. Does that make sense?

#3

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