An apparatus and method to significantly improve performance of certain group queries using an encoded vector index (EVI) is disclosed. An EVI provides the data necessary to generate query results for COUNT, SUM, MIN, and MAX commands that specify the one or more database fields upon which the EVI is...http://www.google.de/patents/US7020647?utm_source=gb-gplus-sharePatent US7020647 - Utilize encoded vector indexing for database grouping
