The principle of orthogonal design (abbreviated POOD) was developed by database researchers David McGoveran and Christopher J.
Date in the early 1990s, and first published "A New Database Design Principle" in the July 1994 issue of Database Programming and Design and reprinted several times.
As with database normalization, POOD serves to eliminate uncontrolled storage redundancy and expressive ambiguity, especially useful for applying updates to virtual relations (e.g., view (database)).
The principle is a restatement of the requirement that a database is a minimum cover set of the relational algebra.
This requirement is met by the minimum cover set of the relational algebra.