Title: Programming Phoenix LiveView: (page 221)
In the part to open up IEx with iex -S mix and do the test drive of the query.
It was needed to added these alias on the Pento.Catalog.Product.Query module:

alias Pento.Survey.{Rating, Demographic}
alias Pento.Accounts.User

Because it complains to:

** (UndefinedFunctionError) function User.__schema__/1 is undefined (module User is not available)
    User.__schema__(:source)
    (ecto 3.6.1) lib/ecto/repo/queryable.ex:208: Ecto.Repo.Queryable.execute/4
    (ecto 3.6.1) lib/ecto/repo/queryable.ex:19: Ecto.Repo.Queryable.all/3

and after to add those alias the query worked!