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- W1885684430 abstract "It is well known that SQL’s syntax sometimes forces users to write queries in an awkward way. Together with the danger of formulating an incorrect query, complex queries pose a challenge to the optimizer. A well studied example is that of universal quantification [1,2]. As an example, assume two relations: student(sid) and teaches(pid,sid), which denotes that professor pid is a teacher of student sid. Consider the question “find the professors teaching all students.” Since SQL does not directly support the quantifier all, most textbooks express this question using two subqueries, NOT EXISTS and NOT IN." @default.
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- W1885684430 date "2008-01-01" @default.
- W1885684430 modified "2023-10-18" @default.
- W1885684430 title "An Implementation of a Query Language with Generalized Quantifiers" @default.
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- W1885684430 doi "https://doi.org/10.1007/978-3-540-87877-3_54" @default.
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