Question

1-What is the source data for Zillow?
2-Why would a person searching Zillow want to use a data mart?

Answer 1

1) Today, Zillow gets its data from variety of sources as it receives data to run its various type of calculations, such as Zestimates, from a third party sources, many not disclosed it because this is their “secret source.” Cities of the US provide open data portals with information Zillow may use for price history, trends, demographics. Other data sources may be Google Places, data.gov, Onboard Informatics, and many others.

2) A person who is searching Zillow would want to use a data mart because it will show them a list of different houses, when they were listed and the price of that houses. It will give them. information about how many rooms the house has, a estimate of the amount of money.