NoSQL is amazing when you have non relational data. Think of it as a giant, distributed hash table. Hash tables are awesome and wicked fast. But toss in relatio

NoSQL is amazing when you have non relational data. Think of it as a giant, distributed hash table. Hash tables are awesome and wicked fast. But toss in relations and now you got some interesting problems. RDMS solves that for you but scaling is now harder. At least in my opinion anyway. You can still use NoSQL in these situations but you're typically duplicating data or indexing it yourself so you can refer back to it. It's all about trade offs. If you're small just pick the best one for the job at hand. When you need scale you can usually hack either into scaling well enough.