When designing applications in MySQL, you'll encounter scenarios that require heavy use of magic numbers. These are constant values that won't immediately make sense to anyone with little knowledge of how your database works. For instance, assume you're creating a `microfinance` bank database. If you've got a table named `charges` that can either have penalties or fees, you might use the characters `P` and `F` to denote the information in a column named `charge_type`. For this information to be ......