Right, I'm talking about many to many relationships. Those are a pain to deal with in non relational databases. It's possible, just not the simplest tool for

Right, I'm talking about many to many relationships. Those are a pain to deal with in non relational databases. It's possible, just not the simplest tool for the task. This is a great strength of sql, especially when coupled with a good orm used wisely. Also, don't underestimate the power of frameworks like rails, django et al for productivity. Most apps I write for my own business, or see in production at companies I work for use a mix of sql and nosql depending on what they are doing. Mongo seems quite popular for heavy write loads, while still supporting some indexing and querying. It's great for fan out also.