Equivalences Among Relational Expressions with the Union and Difference Operators

@article{Sagiv1980EquivalencesAR,
  title={Equivalences Among Relational Expressions with the Union and Difference Operators},
  author={Yehoshua Sagiv and Mihalis Yannakakis},
  journal={J. ACM},
  year={1980},
  volume={27},
  pages={633-655}
}
Queries in relational databases can be formulated in terms of relational expressions using the relational operations select, project, join, union, and difference The equivalence problem for these queries is studied with query optimization m mind It ts shown that testmg eqmvalence of relational expressions with the operators select, project, join, and union is complete m the class FIt of the polynomial-time hierarchy A nonprocedural representation for queries formulated by these expressions is… CONTINUE READING
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