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- Q18355095 subject Q7217201.
- Q18355095 subject Q8363916.
- Q18355095 abstract "In relational database theory, a tuple-generating dependency (TGD) is a certain kind of constraint on a relational database. It is a subclass of the class of embedded dependencies (EDs). A TGD 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 atoms. A relational atom has the form R(w1, ..., wh) where each of the w, ..., wh, wi, wj, are variables or constants. An algorithm known as the chase takes as input an instance that may or may not satisfy a set of TGDs (or more generally EDs), and, if it terminates (which is a priori undecidable), outputs an instance that does satisfy the TGDs.".
- Q18355095 wikiPageExternalLink 305.pdf.
- Q18355095 wikiPageWikiLink Q18206789.
- Q18355095 wikiPageWikiLink Q3479163.
- Q18355095 wikiPageWikiLink Q4809258.
- Q18355095 wikiPageWikiLink Q5087085.
- Q18355095 wikiPageWikiLink Q7217201.
- Q18355095 wikiPageWikiLink Q7926426.
- Q18355095 wikiPageWikiLink Q8363916.
- Q18355095 comment "In relational database theory, a tuple-generating dependency (TGD) is a certain kind of constraint on a relational database. It is a subclass of the class of embedded dependencies (EDs). A TGD 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 atoms.".
- Q18355095 label "Tuple-generating dependency".