In our previous examples, there were always matching values when we were performing our merges. What happens when that isn’t true?
Let’s imagine that our
products table is out of date and is missing the newest product: Product 5. What happens when someone orders it?
We’ve just released a new product with
product_id equal to
5. People are ordering this product, but we haven’t updated the
In script.py, you’ll find two DataFrames:
orders. Inspect these DataFrames using
Notice that the third order in
orders is for the mysterious new product, but that there is no
product_id 5 in
products and save it to the variable
What happened to