747b0392__5_1___Postgres_OnLine_Journal__Microsoft_SQL_Server_2008
[Feature] Materialized/Indexable Views [MySQL 5.1] No [PostgreSQL 8.4] No, but there are I think 2 contrib modules e.g. matviews that are simple and basically rebuild the materialized view [Microsoft SQL Server 2008] 
Yes but varies slightly depending on if you are running SQL Express, Workgroup, Standard, Enterprise and numerous restrictions on your views that makes it of limited use
Cross Compare of PostgreSQL 8.4, SQL Server 2008, MySQL 5.1 - Postgres OnLine Journal
Microsoft SQL Server 2008