Tuple (Relational Algebra)

relational-algebra

Definition

Tuple (Relational Algebra)

A tuple is an element (row) of a relation. As the classic mathematical tuple, tuples in relational algebra are ordered, meaning:

$$(a,b)\ne (b,a)$$

However, the order of attributes is immaterial for most applications.

The set of tuples inside a relation are unordered, i.e.:

$$\{(1,\text{Lukas}),(2,\text{Cedric})\}=\{(2,\text{Cedric}),(1,\text{Lukas})\}$$