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- Embedded_dependency abstract "In relational database theory, an embedded dependency (ED) is a certain kind of constraint on a relational database. It is the most general type of constraint used in practice, including both tuple-generating dependencies (TGDs) and equality-generating dependencies (EGDs). EDs can express functional dependencies, join dependencies, multi-valued dependencies, inclusion dependencies, foreign key dependencies, and many more besides. An ED is a sentence in first-order logic of the form:∀x1 ... xn, P(x1, ..., xn) → ∃z1, ..., zk, Q(y1, ..., ym)where {z1, ..., zk} = {y1, ..., ym} \\ {x1, ..., xn}, and P is a possibly empty and Q is a non-empty conjunction of relational and equality atoms. A relational atom has the form R(w1, ..., wh) and an equality atom has the form wi = wj where each of the w, ..., wh, wi, wj, are variables or constants. When all atoms in Q are equalities, the ED is an EGD, and when all atoms in Q are relational, the ED is a TGD. Every ED is equivalent to an EGD and a TGD. An algorithm known as the chase takes as input an instance that may or may not satisfy a set of EDs, and, if it terminates (which is a priori undecidable), output an instance that does satisfy the EDs.".
- Embedded_dependency wikiPageExternalLink 305.pdf.
- Embedded_dependency wikiPageID "43797617".
- Embedded_dependency wikiPageLength "1632".
- Embedded_dependency wikiPageOutDegree "9".
- Embedded_dependency wikiPageRevisionID "631901767".
- Embedded_dependency wikiPageWikiLink Category:Database_theory.
- Embedded_dependency wikiPageWikiLink Category:Logic.
- Embedded_dependency wikiPageWikiLink Chase_(algorithm).
- Embedded_dependency wikiPageWikiLink Database_theory.
- Embedded_dependency wikiPageWikiLink Equality-generating_dependency.
- Embedded_dependency wikiPageWikiLink Richard_B._Hull.
- Embedded_dependency wikiPageWikiLink Serge_Abiteboul.
- Embedded_dependency wikiPageWikiLink Tuple-generating_dependency.
- Embedded_dependency wikiPageWikiLink Victor_Vianu.
- Embedded_dependency wikiPageWikiLinkText "embedded dependencies".
- Embedded_dependency wikiPageWikiLinkText "embedded dependency".
- Embedded_dependency wikiPageUsesTemplate Template:Computer-stub.
- Embedded_dependency subject Category:Database_theory.
- Embedded_dependency subject Category:Logic.
- Embedded_dependency hypernym Kind.
- Embedded_dependency comment "In relational database theory, an embedded dependency (ED) is a certain kind of constraint on a relational database. It is the most general type of constraint used in practice, including both tuple-generating dependencies (TGDs) and equality-generating dependencies (EGDs). EDs can express functional dependencies, join dependencies, multi-valued dependencies, inclusion dependencies, foreign key dependencies, and many more besides. An ED is a sentence in first-order logic of the form:∀x1 ...".
- Embedded_dependency label "Embedded dependency".
- Embedded_dependency sameAs Q18206789.
- Embedded_dependency sameAs m.011v5q32.
- Embedded_dependency sameAs Q18206789.
- Embedded_dependency wasDerivedFrom Embedded_dependency?oldid=631901767.
- Embedded_dependency isPrimaryTopicOf Embedded_dependency.