The first approach is manual integration, where the DBA is provided with a schema restructuring language. In addition our language allows for the specification of constraints that arise from Human Genome data which are not representable using established constraint languages. Central to all of these approaches is the need to have some user manipulation of the underlying schemas to indicate how the underlying databases are related to the merged schema. However, to the best of our knowledge, the question of what meaning or semantics this merging process should have has not been adequately explored. A tool for integrating conceptual schemas and user views .
Users can declare .
A Tool for Integrating Conceptual Schemas and User Views . When a global view is constructed, queries are issued against the global view. A tool for integrating conceptual schemas and user views . IEEE Computer Society Press, 1988. Since our intended users are not database experts, we have paid careful attention to developing multidatabase user views of the available biological data sources.