If all rows in a database are null, does that make it meaningless? No, it doesn't, if the intended value is for it to be null. However, if the intended value i

If all rows in a database are null, does that make it meaningless? No, it doesn't, if the intended value is for it to be null. However, if the intended value is for it to be something else, then it makes the data incorrect. So, if guests are trying to say every host on Airbnb is amazing, and they are in fact all amazing, then great. But if not, then we need some other way for guests to indicate "host was not acceptable"