How to get all changes and unchanged records in a table?

I'm trying to subscribe to table and get the latest posts using realtime. If I subscribe I only get the changes. Is there a way to subscribe to the data and changes (like the Firebase API) or do I have to handle integrating the changes myself?

Something like
const { data, error } = await supabase
  .from('countries')
  .select()
but in realtime.

I used supabase a while ago and I'm saw there was a standard way to do this but I can't seem to find it in the docs now.
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