<!doctype html public «-//w3c//dtd html 4.0 transitional//en»> http-equiv=content-type> This graduate text book provides a formal analysis of alternative, non-relational data models and storage mechanisms and gives a decent overview of non-SQL query languages. It describes a perspective beyond SQL and relational database management systems and thus covers the theoretical background of modern data management. It also helps to take informed decisions about what database systems to use.
