I am learning about database warehouses and data modeling. I came across this blog post. In the section, "DIFFERENT MODELS HAVE DIFFERENT PURPOSES" the author mentions that depending upon the need of the business, there can be two types of data modeling:
However, in both examples the author says that the modeling is done in 3NF form, I am confused, how is 3NF and star schema both used in dimensional model. Aren't they supposed to be fundamentally different?
Lastly, if I understand correct, the relational data modeling is done for OLTP systems and Dimensional is done for OLAP systems, right?