What does relvar mean?

Definitions for relvar
rel·var

This dictionary definitions page includes all the possible meanings, example usage and translations of the word relvar.


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Wiktionary

  1. relvarnoun

    A variable that contains a relation, as distinguished from the relation itself.

  2. Etymology: Contraction of relation variable, coined by Christopher J Date.

Wikipedia

  1. Relvar

    In relational databases, relvar is a term introduced by C. J. Date and Hugh Darwen as an abbreviation for relation variable in their 1995 paper The Third Manifesto, to avoid the confusion sometimes arising from the use of the term relation, by the inventor of the relational model, E. F. Codd, for a variable to which a relation is assigned as well as for the relation itself. The term is used in Date's well-known database textbook An Introduction to Database Systems and in various other books authored or coauthored by him. Some database textbooks use the term relation for both the variable and the data it contains. Similarly, texts on SQL tend to use the term table for both purposes, though the qualified term base table is used in the standard for the variable. A closely related term often used in academic texts is relation schema, this being a set of attributes paired with a set of constraints, together defining a set of relations for the purpose of some discussion (typically, database normalization). Constraints that mention just one relvar are termed relvar constraints, so relation schema can be regarded as a single term encompassing a relvar and its relvar constraints.

Wikidata

  1. Relvar

    In relational databases, a relvar is a term coined by C. J. Date as an abbreviation for the concept of relation variable, which is the actual term used by the inventor of the relational model, E. F. Codd, regarding the same concept. The term is used in Date's well-known database textbook An Introduction to Database Systems to differentiate between a variable that contains a relation and the relation itself. Relvar is not universally accepted as a term, and it certainly has no meaning in the context of existing database management system products that support SQL. Other database textbooks use the term relation for both the variable and the data it contains. This is most likely because in SQL there are no variables, nor are there assignment operators. Other authors use relation schema for this concept.

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Numerology

  1. Chaldean Numerology

    The numerical value of relvar in Chaldean Numerology is: 1

  2. Pythagorean Numerology

    The numerical value of relvar in Pythagorean Numerology is: 4


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"relvar." Definitions.net. STANDS4 LLC, 2024. Web. 17 Apr. 2024. <https://www.definitions.net/definition/relvar>.

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