6. please help


#1

I don't understand this exercise at all and am completely lost. I understand what we are trying to accomplish, but the example given is very vague. Can somebody please give a line-by-line break down in simple terms?

Note, I'm referring to the code from the example given and NOT from what they are asking us to do

https://www.codecademy.com/en/courses/sql-table-transformation/lessons/subqueries/exercises/correlated-ii?action=resume

SELECT carrier, id,
       (SELECT COUNT(*)
  FROM flights f
 WHERE f.id < flights.id
   AND f.carrier = flights.carrier) + 1
    AS flight_sequence_number
  FROM flights
 ORDER BY flight_sequence_number;



Replace this line with your code.


#2

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