Topic: Relational or NoSQL?
There are some companies which exchange the data about clients in the form of messages.
It is necessary to organize decentral distributed system of data storage about clients.
I will present it so, each company stores a copy of a DB and adds there necessarily a card of the dataful client or some cards, it is desirable that it was possible to add necessarily fields in a card or there was a possibility of a choice of an added field from earlier fixed additional fields. Also it would be desirable, that package adding of cards was supported.
By means of what it is the better and most convenient for organizing?