noun
relation algebra
A mathematical structure in the field of abstract algebra, dealing with binary relations and operations such as composition and converse.
関係代数は、二項関係を扱う代数系の一つである。
Relation algebra is one of the algebraic systems dealing with binary relations.
noun
relational algebra
In database theory, a formal system for manipulating relations (tables) using operations like selection, projection, and join.
SQLの基礎には関係代数の考え方がある。
The foundation of SQL lies in the concepts of relational algebra.