Natural Key

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A Natural Key is an Unique Key that ...



References

2017

  • (Wikipedia, 2017) ⇒ https://en.wikipedia.org/wiki/natural_key Retrieved:2017-4-17.
    • A natural key (also known as business key [2] ) is a type of unique key, found in relational model database design, that is formed of attributes that already exist in the real world. It is used in business-related columns. [3] In other words, a natural key is a candidate key that has a logical relationship to the attributes within that row. A natural key is sometimes called domain key. [4]

      The main advantage of a natural key over a surrogate key, which has no meaning outside the database environment, is that it already exists; there is no need to add a new, artificial column to the schema. Using a natural key (when one can be identified) also simplifies data quality: It ensures that there can only be one row for a key; this single version of the truth can be verified because the natural key is based on a real-world observation.