Amazon has a perfect use case for this. You click on a product in the search results, that url contains a UUID, that UUID is used to search Dynamo and returns an object that has all the information on the product, from that you build the page.
If what you are trying to do looks more like "Give me all the customers that live in Cuba and have spent more than $10 and have green eyes", Dynamo isn't for you. You can query that way but after you put all the work in to get it up and running, you'd probably be better off with Postgres.
If that's one of 12 or less query patterns you need, I can write you a simple dynamo table for it.
Dynamo's limitation is that it can only support n different query patterns, and you have to hand craft an index for each one(well, sometimes you can get multiple on one index)
If what you are trying to do looks more like "Give me all the customers that live in Cuba and have spent more than $10 and have green eyes", Dynamo isn't for you. You can query that way but after you put all the work in to get it up and running, you'd probably be better off with Postgres.