Declarative Rule

• Name: Source Data Access
• Description in English: This rule represents the result of a subquery executed againts a remote (or local) source. The subquery can range from a simple realtion scan to a complex SQL query.
• Example in English: DataAccess(cdw, "laptop(processor, ram, hardrive, price, ...)") DataAccess(db1, "select x, y from R, S where R.y = S.y")
• Source(s):
  • Name: A Relational Model of Data for Large Shared Data Banks
  • URL: http://www.acm.org/classics/nov95/
  • Author(s):
    • Name: Edgar F. Codd
    • URL: http://www.acm.org/awards/turing_citations/codd.html
  • Publisher:
    • Name: Association for Computing Machinery
    • URL: http://www.acm.org/
  • Year: 1970

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