Attribute Values, Data Domains, and Data Types

Relation

The definition for relation mentions attribute values that are part of data domains. A domain here is similar to the one we read about in mathematics—a set of values that are given a common name. There’s the data domain of natural numbers and the data domain of rational numbers in mathematics.

Tuple

In relational theory, we can compose basic data domains into a tuple. The definition for a tuple is as follows:

“The term originated as an abstraction of the sequence: single, double, triple, quadruple, ...