You can't? Most people only see the relational model as is inside a RDBMS. That is how judge the OO for what you can do on Mongo. RDBMS have some weird and we

You can't? Most people only see the relational model as is inside a RDBMS. That is how judge the OO for what you can do on Mongo. RDBMS have some weird and well considered restrictions for their case. But read a little about the relational model, and none of it depend on SQL or say anything about how is the storage. P.D: Is important to note for where is MORE powerful. Remember that the creator of Pascal say: https://en.wikipedia.org/wiki/Algorithms_%2B_Data_Structures_%3D_Programs https://en.wikipedia.org/wiki/Algorithms_%2B_Data_Structures... Algorithms + Data Structures = Programs You can say OO/Functional lean more to the "Algorithms" side but RM to the "Data Structures". OO/Functional not say much how operate on data, most is a exercise for the reader. Instead, RM give a clear answer and defined operations for that. You need to "spice up" things to make the one be more useful to the other part of the equation. RM, too pure, certainly is incredible limited, not even can print "hello world!", but that is just too give a solution about how transform data...