Identifying the Extent of Completeness of Query Answers over Partially Complete Databases
Simon Razniewski, Flip R. Korn, Werner Nutt, Divesh Srivastava · 2015
In many applications including loosely coupled cloud databases, collaborative editing and network monitoring, data from multiple sources is regularly used for query answering. For reasons such as system failures, insufficient author knowledge or network issues, data may be temporarily unavailable or generally nonexistent. Hence, not all data needed for query answering may be available.