Non-first normal form universal relations: an application to information retrieval systems.
Bipin C. DesaiPankaj GoyalFereidoon SadriPublished in: Inf. Syst. (1987)
Keyphrases
- information retrieval systems
- normal form
- data dependencies
- database design
- relational calculus
- relational databases
- functional dependencies
- information retrieval
- inverted file
- relational algebra
- document collections
- retrieval systems
- query expansion
- nested relations
- set of functional dependencies
- user queries
- null values
- retrieval model
- document indexing
- relevant documents
- relevance feedback
- boolean expressions
- relational model
- database
- data model
- training set
- databases