Which of the following criteria was a key milestone for the relational model created in the mid-1970s? a.) One of the milestones during this period was introducing the schema. b.) One of the milestones during this period was the creation of a tuple or a table row within a relation. c.) One of the milestones during this period was the use of Unified Modeling Language to represent the data models. d.) One of the milestones during this period was focusing on having support for large databases at a terabyte size.

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05-12-2022
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Which of the following criteria was a key milestone for the relational model created in the mid-1970s? a.) One of the milestones during this period was introducing the schema. b.) One of the milestones during this period was the creation of a tuple or a table row within a relation. c.) One of the milestones during this period was the use of Unified Modeling Language to represent the data models. d.) One of the milestones during this period was focusing on having support for large databases at a terabyte size.

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afreenmajid123 afreenmajid123 · Answer 1 · 2022-12-07T11:42:04-05:00

(C) is correct One of the milestones during this period was the use of the Unified Modeling Language to represent data models. One of the milestones of this period was the creation of a single structure that contained both the data and its relationships.

It was based on the mathematical theory of sets and on the representation of data as independent relations. The relational database was first defined in June 1970 by Edgar Codd of the IBM Research Laboratory in San Jose. Codd's vision of what he qualifies as an RDBMS is summarized in Codd's 12 Rules. The relational model consists of two main components the structures that allow to organize the data; the integrity constraints that allow the data to remain consistent. The relational model can be represented as a table with columns and rows. Each row is known as a tuple. Each column table has a name or attribute. Domain contains a set of atomic values that an attribute can take. Attribute contains the name of a column in a particular table.

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