6. please help

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

<PLEASE USE THIS TEMPLATE TO HELP YOU CREATE A GREAT POST!>

<Below this line, add a link to the EXACT exercise that you are stuck at.>

https://www.codecademy.com/en/courses/sql-table-transformation/lessons/subqueries/exercises/correlated-ii?action=resume
<Below this line, in what way does your code behave incorrectly? Include ALL error messages.>

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;

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<If you wish to copy/paste in your code, you can use this next section. This will allow others to copy/paste your code for testing – something that they won’t be able to do with just a screenshot.>

```

Replace this line with your code.

<do not remove the three backticks above>

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