2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/109803Relational lattice reduces the set of six classic relational algebra operators to two binary lattice operations: natural join and inner union. We give an introduction to this theory with emphasis on formal algebraic laws. New results include Spight distributivity criteria and its applications to query transformations.11 pages, 3 figuresDatabasestext