Conjunctive Query Equivalence of Keyed Relational Schemas.
Joseph AlbertYannis E. IoannidisRaghu RamakrishnanPublished in: PODS (1997)
Keyphrases
- relational schema
- conjunctive queries
- schema mappings
- query containment
- logical equivalence
- data exchange
- integrity constraints
- datalog programs
- functional dependencies
- relational database theory
- query answering
- normal form
- data integration
- database schema
- entity relationship
- xml schema
- conceptual schema
- query evaluation
- query language
- data model
- relational data
- relational database systems
- relational model
- np complete
- relational databases
- xml data
- query rewriting
- query processing
- acyclic conjunctive queries
- object oriented
- databases
- database design
- data management
- transformation rules
- special case
- data sets
- database technology
- data types
- domain knowledge
- database