Just got curious about the entire history of how SQL server evolved since its birth. Here is a short blog reflecting the research.
For an interesting story on how SQL server evolved, please refer the document History of SQL Server.
A brief history of SQL Server is available in the table below (along with the relevant links to corresponding resources):
| Year | SQL Server Version | Code Name |
| 2012 | Denali | |
| 2010 | Kilimanjaro (aka KJ) | |
| 2010 | Matrix (aka CloudDB) | |
| 2008 | Katmai | |
| 2005 | SQL Server Integration Services (formerly Data Transformation Services) | |
| 2005 | Yukon | |
| 2004 | | |
| 2003 | SQL Server 2000 (64-bit Edition) | Liberty |
| 2000 | Shiloh | |
| 2000 | | |
| 1999 | SQL Server 7.0 OLAP Services (including Data Transformation Services) | Plato |
| 1998 | Sphinx | |
| 1996 | Hydra | |
| 1995 | SQL Server 6.0 | SQL95 |
| 1993 | SQL Server 4.2 (32 bit Edition) | SQLNT |
| 1991 | SQL Server 1.1 | |
| 1989 | SQL Server 1.0 (16bit) | Ashton-Tate/Microsoft SQL Server |
Also details of some of the specific release dates and build numbers are available on MSDN link.
Some guidelines on upgrade paths (till SQL Server 2008 R2) are available on MSDN here.
More technical details about each version is available here.
the same information is now available in form of an interesting video here: http://blogs.technet.com/b/dataplatforminsider/archive/2012/02/15/new-video-the-history-of-sql-server.aspx?wa=wsignin1.0
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