Null (SQL) and Relational Model/Tasmania

Shortcuts: Differences, Similarities, Jaccard Similarity Coefficient, References.

Difference between Null (SQL) and Relational Model/Tasmania

Null (SQL) vs. Relational Model/Tasmania

Null (or NULL) is a special marker used in Structured Query Language to indicate that a data value does not exist in the database. Relational Model/Tasmania (RM/T) was published by Edgar F. Codd in 1979 and is the name given to a number of extensions to his original relational model (RM) published in 1970.

Similarities between Null (SQL) and Relational Model/Tasmania

Null (SQL) and Relational Model/Tasmania have 3 things in common (in Unionpedia): Christopher J. Date, Edgar F. Codd, Relational model.

Christopher J. Date

Chris Date (born 1941) is an independent author, lecturer, researcher, and consultant, specializing in relational database theory.

Christopher J. Date and Null (SQL) · Christopher J. Date and Relational Model/Tasmania · See more »

Edgar F. Codd

Edgar Frank "Ted" Codd (19 August 1923 – 18 April 2003) was an English computer scientist who, while working for IBM, invented the relational model for database management, the theoretical basis for relational databases and relational database management systems.

Edgar F. Codd and Null (SQL) · Edgar F. Codd and Relational Model/Tasmania · See more »

Relational model

The relational model (RM) for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd, where all data is represented in terms of tuples, grouped into relations.

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The list above answers the following questions

What Null (SQL) and Relational Model/Tasmania have in common
What are the similarities between Null (SQL) and Relational Model/Tasmania

Null (SQL) and Relational Model/Tasmania Comparison

Null (SQL) has 81 relations, while Relational Model/Tasmania has 9. As they have in common 3, the Jaccard index is 3.33% = 3 / (81 + 9).

References

This article shows the relationship between Null (SQL) and Relational Model/Tasmania. To access each article from which the information was extracted, please visit:

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