FAQ: Subqueries - Non-Correlated Subqueries I


#1

This community-built FAQ covers the “Non-Correlated Subqueries I” 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 I

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#2

Since these tables are not joined by an primary key, how does it identify commonalities?


#3

no hints in the class?


#4

i have the same question!


#5

I have the same question too.


#6

Because the subquery returns the airports codes which are the same as the codes in the flights origin columns, this is the commonality


#7

Hi
If the nesting query is unrelated to main query, why do we have to use ‘code’ from the airports table to get the results …why can’t any other column be used ?


#8

Same question here! Why doesn’t it work when you replace ‘code’(from airports) with id (from airports)
both are unique?