1. Launch day · Done when

Done when

  • The diagram shows users with 5 columns and posts with 7, each with id marked as the primary key.
  • You can answer: why does updated_at go in a second file instead of being added to the CREATE TABLE in 001?
  • You can answer: posts.user_id is meant to hold a user's id. What stops it from holding 99999 when no such user exists? (Nothing yet. That's Level 2.)