Repetitions and permutations of columns in the semijoin algebra.
Dirk LeindersJan Van den BusschePublished in: RAIRO Theor. Informatics Appl. (2009)
Keyphrases
- relational algebra
- algebraic expressions
- data model
- database query processing
- join operator
- boolean algebra
- relation algebra
- data structure
- query language
- set theory
- distributive lattices
- algebraic structures
- algebraic structure
- databases
- query optimization
- probability distribution
- case study
- artificial intelligence