X-Time: Schema Versioning and Cross-Version Querying in Data Warehouses
Stefano Rizzi, Matteo Golfarelli · 2007
In this demo we present X-Time, a prototype for managing schema versioning in relational data warehouses, specifically oriented to support the formulation of cross-version queries, i.e., queries whose temporal horizon spans multiple versions. The key issue to increase querying flexibility is the introduction of augmented schemata that properly extend previous schema versions.