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I would like to know if the function of with in this project is correct

with q as (select ‘1-quiz’ as stage, count(distinct user_id)
from quiz

‘1-quiz’ this column never exist in quiz table. In with clause, can I create new column ?

I got this query from codecademy you tube video. This is question 6.

What I know is that after Select only existing column list can come
select ( column_list ) from (table).