Saving Data on Android

Crea/ng Room migra/ons
Right now, you have a very nice app that displays a series of random questions to 
your users. You store these questions in a 
question
 table, which is represented as a 
Question
 entity class in your code.
But what happens if you want to add difficulty levels like easy, medium and hard?
Saving Data on Android
Chapter 10: Migrations with Room
raywenderlich.com
174

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Well, right now your question table doesn't have an attribute to classify questions 
based on their difficulty. So your first step is to add a new column to provide that 
functionality to your users. Here's how you do that:
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