Ecto.Migration.create

You're seeing just the macro create, go back to Ecto.Migration module for more information.

create(object, list)

Creates a table.

By default, the table will also include an :id primary key field that has a type of :bigserial. Check the table/2 docs for more information.

create table(:posts) do
  add :title, :string, default: "Untitled"
  add :body,  :text

  timestamps()
end