natural key


natural key
an identification key that reflects evolutionary relationships within the branching sequence of the key

Dictionary of ichthyology. 2009.

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  • Natural key — In relational model database design, a natural key is a candidate key that has a logical relationship to the attributes within that row. A natural key is sometimes called a domain key. The main advantage of a natural key over a surrogate key,… …   Wikipedia

  • natural key — noun : a key used to determine the name of a plant or animal and based on genetic relationships especially as shown by chromosome counts compare artificial key …   Useful english dictionary

  • Key signature — For use in cryptography, see Key signature (cryptography). Key signature A major / F♯ minor with three sharps placed after the clef. In musical notation, a key signature is a series of sharp or …   Wikipedia

  • natural — adj. & n. adj. 1 a existing in or caused by nature; not artificial (natural landscape). b uncultivated; wild (existing in its natural state). 2 in the course of nature; not exceptional or miraculous (died of natural causes; a natural occurrence) …   Useful english dictionary

  • Natural Bridge Battlefield Historic State Park — Natural Bridge Battlefield State Historic Site IUCN Category V (Protected Landscape/Seascape) …   Wikipedia

  • Natural horn — in the V A Museum, London Classification Brass instrument The natural horn is a musical instrument that is the ancestor of the modern day horn, and is differentiated by its lack of valves. It consist …   Wikipedia

  • Natural — Nat u*ral (?; 135), a. [OE. naturel, F. naturel, fr. L. naturalis, fr. natura. See {Nature}.] 1. Fixed or determined by nature; pertaining to the constitution of a thing; belonging to native character; according to nature; essential;… …   The Collaborative International Dictionary of English

  • Natural day — Natural Nat u*ral (?; 135), a. [OE. naturel, F. naturel, fr. L. naturalis, fr. natura. See {Nature}.] 1. Fixed or determined by nature; pertaining to the constitution of a thing; belonging to native character; according to nature; essential;… …   The Collaborative International Dictionary of English

  • Natural fats — Natural Nat u*ral (?; 135), a. [OE. naturel, F. naturel, fr. L. naturalis, fr. natura. See {Nature}.] 1. Fixed or determined by nature; pertaining to the constitution of a thing; belonging to native character; according to nature; essential;… …   The Collaborative International Dictionary of English

  • Natural gas — Natural Nat u*ral (?; 135), a. [OE. naturel, F. naturel, fr. L. naturalis, fr. natura. See {Nature}.] 1. Fixed or determined by nature; pertaining to the constitution of a thing; belonging to native character; according to nature; essential;… …   The Collaborative International Dictionary of English


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