Ingres 9.2 Migration Guide - Actian

Appendix D: Features Introduced inIngres 2006 Release 2This section contains the following topics:New Features in the DBMS Server (see page 155)Ease of Use Enhancements (see page 158)Connectivity Enhancements (see page 159)Supportability Enhancement (see page 162)Usability Enhancements (see page 162)Removed or Deprecated Features (see page 162)New Features in the DBMS ServerIngres 2006 Release 2 enhancements to the DBMS Server allow for betterintegration by Ingres partners. New features for application developersinclude:• Additional flexibility in application design.• Simplified migration of existing applications that run against non-Ingresdatabase architectures.Derived TablesA derived table results when you code a SELECT in the FROM clause of aSELECT or UPDATE statement.Derived tables let you create or simplify complex queries. Useful in datawarehousing applications, they provide a way to isolate complex portions ofquery syntax from the rest of a query.Some complex queries cannot be implemented without using either predefinedviews or derived tables. The derived table behaves like an inline view,but is more concise and avoids having to define persistent objects that may beused for a single query only.For details on derived tables, see the SQL Reference Guide.Features Introduced in Ingres 2006 Release 2 155