logic   20015

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Say NO to Venn Diagrams When Explaining JOINs – Java, SQL and jOOQ.
In recent times, there have been a couple of tremendously popular blog posts explaining JOINs using Venn Diagrams. After all, relational algebra and SQL are set oriented theories and languages, so it only makes sense to illustrate set operations like JOINs using Venn Diagrams. Right? Google seems to say so: Everyone uses Venn Diagrams to…
database  programming  sql  joins  reference  data  IFTTT  databases  logic  code 
10 days ago by dot404
Data Tables with Similarity Relations: Functional Dependencies, Complete Rules and Non-redundant Bases | SpringerLink
We study rules A⟹BA⟹B describing attribute dependencies in tables over domains with similarity relations. A⟹BA⟹B reads “for any two table rows: similar values of attributes from A imply similar values of attributes from B”. The rules generalize ordinary functional dependencies in that they allow for processing of similarity of attribute values. Similarity is modeled by reflexive and symmetric fuzzy relations. We show a system of Armstrong-like derivation rules and prove its completeness (two versions). Furthermore, we describe a non-redundant basis of all rules which are true in a data table and present an algorithm to compute bases.
database  logic  esoteric  sources 
10 days ago by kmt

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