name: nation
table: public.nation
grain: [n_nationkey]
columns:
  - name: n_nationkey
    type: number
  - name: n_name
    type: string
  - name: n_regionkey
    type: number
  - name: n_comment
    type: string
joins:
  - to: region
    "on": n_regionkey = region.r_regionkey
    relationship: many_to_one