This just sequence of my previous post……

I agree with Justin that concept exist before the relational database was invented. Last time I know they call it EIS then they name it MIS and now data warehouse. But what I am taking about is modern data warehouse technique, I really doubt that any other type of database can support it without following relational database concept. Let me know which one?

I am still searching for my answers and have discuss with lot of people, but when I asked them have they seen any implementation of data warehouse without using relational database, the answer that I get is always negative.