Equivalence of queries that are sensitive to multiplicities

@article{Cohen2008EquivalenceOQ,
  title={Equivalence of queries that are sensitive to multiplicities},
  author={Sara Cohen},
  journal={The VLDB Journal},
  year={2008},
  volume={18},
  pages={765-785}
}
The query equivalence problem has been studied extensively for set-semantics and, more recently, for bag and bag-set semantics. However, SQL queries often combine set, bag and bag-set semantics. For example, an SQL query that returns a multiset of elements may call a subquery or view that returns a set of elements. Queries may access both relations that do not contain duplicates, as well as relations with duplicates. As another example, in SQL one can compute a multiset-union of queries, each… CONTINUE READING
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