747b0392__5_1___Postgres_OnLine_Journal__Microsoft_SQL_Server_2008
[Feature] Functional Indexes - indexes based on a function [MySQL 5.1] No [PostgreSQL 8.4] Yes [Microsoft SQL Server 2008] 
No - but you can create a computed column and create an index on it
Cross Compare of PostgreSQL 8.4, SQL Server 2008, MySQL 5.1 - Postgres OnLine Journal
Microsoft SQL Server 2008