Schema Mapping in Multidatabase Systems
Weijun Xiao · Computer Engineering and Science · 2004
There are four levels of schema structures in multidatabase systems. Multidatabase global users can only access global schemas. But the final answer should be obtained from local database systems. So, schema mappings, which represent the transformation and integration from local schemas to export schemas and from export schemas to global schemas, should be established. This paper gives an approach of schema mapping in multidatabase systems and uses a schema mapping tree to store and express these mappings.