Keyphrases
- query formulation
- relational databases
- query reformulation
- sql queries
- query language
- data types
- database
- database language
- query refinement
- databases
- relational model
- interactive query expansion
- database queries
- relational algebra
- database applications
- cd rom
- database design
- spatial data
- query generation
- relational dbms
- visual query language
- keywords