Create a new DataFrame called order_lines that joins the orders and products DataFrames on the "ProductID" and "Product_ID" fields using an inner join:
Create a new DataFrame called order_lines that joins the orders and products DataFrames on the "ProductID" and "Product_ID" fields using a left outer join:
Create a new DataFrame called order_lines that joins the orders and products DataFrames on the "ProductID" and "Product_ID" fields using a right outer join:
Create a new DataFrame called order_lines that joins the orders and products DataFrames on the "ProductID" and "Product_ID" fields using a full outer join:
Concatenate the rows in the order_lines DataFrame with the rows in the promo_lines Dataframe:
Concatenate the columns in the fiction_orders DataFrame with the columns in the non_fiction_orders Dataframe: