747b0392__5_1___Postgres_OnLine_Journal__Microsoft_SQL_Server_2008
[Feature] Can add columns and change names, data types of views without dropping [MySQL 5.1] Yes [PostgreSQL 8.4] Yes - sort of - as of 8.4 you can now add columns to the end of view without dropping it. [Microsoft SQL Server 2008] 
Yes
Cross Compare of PostgreSQL 8.4, SQL Server 2008, MySQL 5.1 - Postgres OnLine Journal
Microsoft SQL Server 2008