Data Integration and Data Exchange
March 24, 2006
I will discuss two fundamental problems in information integration:
- how to answer a query over a public interface which combines data from several sources and
- how to create a single database conforming to the public interface which combines data from several sources.
I consider the case where the sources are relational databases, where the public interface is a public schema (a specification of the format of a database), and where the sources are related to the public schema by a mapping that is specified by constraints.