Relational Database. Informal Introduction. Part 4 Fitting various data into tables

Conceptual database design discussion illustrated by sql queries practice examples started in previous parts continues. Database joins explained as structures with multiple tables are presented.
Relational database concepts are illustrated by sql server schema design approaches. Conceptual data model is explained for some typical database design cases - like handling of repeated values, many to many relationship, working with hierachiies of different kinds, graph structures, unstructured data.