activerecord-setops (rubygems): Union, Intersection, and Difference operations for ActiveRecord
Keywords: activerecord|activerecord-extension|activerecord-queries|arel|query|relational-algebra|relational-database|relational-databases|ruby|ruby-gem|ruby-on-rails|set|set-operations|set-theory|sets|sql|sql-except|sql-intersect|sql-union|sql-unionall