Statistical Estimators for Aggregate Relational Algebra Queries.
Wen-Chi HouGultekin ÖzsoyogluPublished in: ACM Trans. Database Syst. (1991)
Keyphrases
- relational algebra
- aggregate functions
- query language
- relational calculus
- relational database systems
- database query languages
- probabilistic databases
- nested relational
- expressive power
- relational model
- relational operators
- duplicate elimination
- data model
- normal form
- relational data model
- complex objects
- recursive queries
- sparql queries
- first order logic
- algebraic operations
- transitive closure
- aggregate queries
- null values
- query evaluation
- join operator
- relational databases
- sql queries
- summary tables
- database
- object oriented
- query processing
- database technology
- artificial intelligence
- database systems
- xml schema
- user defined