joins2

db.homeSales.findOne()
{
  "_id": ObjectId("56005dd980c3678b19792b7f"),
  "amount": 9000,
  "date": ISODate("1996-09-19T00:00:00Z"),
  "address": {
    "nameOrNumber": 25,
    "street": "NORFOLK PARK COTTAGES",
    "town": "MAIDENHEAD",
    "county": "WINDSOR AND MAIDENHEAD",
    "postcode": "SL6 7DR"
  }
}

db.postcodes.findOne()
{
  "_id": ObjectId("5600521e50fa77da54dfc0d2"),
  "postcode": "SL6 0AA",
  "location": {
    "type": "Point",
    "coordinates": [
      51.525605,
      -0.700974
    ]
  }
}