747b0392__5_1___Postgres_OnLine_Journal__Microsoft_SQL_Server_2008
[Feature] Updateable Views [MySQL 5.1] Yes - Single one table views are automatically updateable, some 2 table views are updateable if they don't have left joins and don't involve update of more than one table. If you have more complex views you want to make updateable - good riddance - no support for triggers or rules on views. [PostgreSQL 8.4] Yes, but not automatic. You have to write rules against views to make them updateable but can make very complicated views updateable as a result. [Microsoft SQL Server 2008] 
Yes - even for 2 table views will automatically make them updateable if they have keys and update does not involve more than one table. You can write instead of triggers against more complex views to make them updateable
Cross Compare of PostgreSQL 8.4, SQL Server 2008, MySQL 5.1 - Postgres OnLine Journal
Microsoft SQL Server 2008