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Optimal implementation of conjunctive queries in relational data bases
Open accessAbstract
We define the class of conjunctive queries in relational data bases, and the generalized join operator on relations. The generalized join plays an important part in answering conjunctive queries, and it can be implemented using matrix multiplication. It is shown that while answering conjunctive queries is NP complete (general queries are PSPACE complete), one can find an implementation that is within a constant of optimal. The main lemma used to show this is that each conjunctive query has a unique minimal equivalent query (much like minimal finite automata).
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Cites
A relational model of data for large shared data banks
Codd, E. F. (1970) · Communications of the ACM · doi:10.1145/362384.362685 · Cited by 5,547
Gaussian elimination is not optimal
Strassen, V. (1969) · Numerische Mathematik · doi:10.1007/bf02165411 · Cited by 2,509
Cited by
Data exchange: semantics and query answering
Fagin, R., Kolaitis, P. G., Miller, R. J., & Popa, L. (2005) · Theoretical Computer Science · doi:10.1016/j.tcs.2004.10.033 · Cited by 1,206
Green, T. J., Karvounarakis, G., & Tannen, V. (2007) · Proceedings of the twenty-sixth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems · doi:10.1145/1265530.1265535 · Cited by 812
Complexity and expressive power of logic programming
Dantsin, E., Eiter, T., Gottlob, G., & Voronkov, A. (2001) · ACM Computing Surveys · doi:10.1145/502807.502810 · Cited by 739
Metadata
- Authors
- Chandra, A. K., & Merlin, P. M.
- Venue
- Proceedings of the ninth annual ACM symposium on Theory of computing - STOC '77
- Publisher
- ACM Press
- Published
- 1977
- Pages
- 77-90
- OpenAlex
- W1979514837
- Cited by
- 1,224
- References
- 2
- FWCI
- 6.76
- Type
- conference paper
- Language
- en
- Open access
- bronze
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- Chandra, A. K., & Merlin, P. M. (1977). Optimal implementation of conjunctive queries in relational data bases. Proceedings of the ninth annual ACM symposium on Theory of computing - STOC '77. https://doi.org/10.1145/800105.803397
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