747b0392__5_1___Postgres_OnLine_Journal__Microsoft_SQL_Server_2008
[Feature] Sequences /Auto Number [MySQL 5.1] Yes - via AUTO_INCREMENT of int field [PostgreSQL 8.4] Yes - via serial data type or defaulting to next Sequence of existing sequence object - this is better than MySQL and SQL Server simple auto_increment feature. The reason it is better is that you can use the same sequence object for multiple tables and you can have more than one per table. In the past PostgreSQL sequence was a pain but now you just create it with data type serial if you want it to behave like SQL Server and MySQL and it will automatically drop the sequence if you drop the table it is bound to. [Microsoft SQL Server 2008] 
Yes - via IDENTITY property of int field
Cross Compare of PostgreSQL 8.4, SQL Server 2008, MySQL 5.1 - Postgres OnLine Journal
Microsoft SQL Server 2008