Order1:
  id: 1200
  customer_id: ${{ REF(Alice) }}
  item_id: ${{ REF(Apple) }}
  quantity: 2
  purchased_at: "2021-03-01T15:15:44"
Order2:
  id: 1201
  customer_id: ${{ REF(Bob) }}
  item_id: ${{ REF(Melon) }}
  quantity: 1
  purchased_at: "2021-03-02T07:51:20"
Order3:
  id: 1202
  customer_id: ${{ REF(Alice) }}
  item_id: ${{ REF(Carrot) }}
  quantity: 4
  purchased_at: "2021-03-10T10:10:33"
Order4:
  id: 1203
  customer_id: ${{ REF(Dev) }}
  item_id: ${{ REF(Melon) }}
  quantity: 2
  purchased_at: "2021-03-11T11:55:44"