There are several different flavors of SQL Server 2005 floating around. Note that there is no longer going to be a push toward a milestone like "Beta 3," so don't be watching for it. Microsoft has adopted a CTP-only approach that will be in place for the remainder of the beta period.

As for specific build numbers, I have tried to maintain a mapping table, and while it has all of the public releases, it only shows some of the versions that were distributed to smaller audiences, such as TAP customers and other early adopters.

Run the following query (which uses a CTE, for fun):

WITH Version(ver)
AS
(
    SELECT SUBSTRING
    (
        @@VERSION,
        CHARINDEX(' - ', @@VERSION)+3,
        32
    )
)
SELECT Build = LEFT(ver, CHARINDEX(' ', ver))
    FROM Version

(Note that this query will not run on SQL Server 2000 or other previous versions.)

You should see a result from this table:

<

Build	Explanation
9.00.608	Beta 1
9.00.645	Internal build (???)
9.00.747	Internal build (IDW1)
9.00.767	Internal build (IDW2)
9.00.790	Internal build (IDW3)
9.00.823	Internal build (IDW4)
9.00.836	Express Edition Technical Preview
9.00.844	Internal build (???)
9.00.849	Internal build (???)
9.00.852	Beta 2
9.00.917	Internal build (???)
9.00.951	October CTP Release
9.00.981	December CTP Release
9.00.1090	March CTP Release (Documented as "February")
9.00.1116	April CTP Release
9.00.1187	June CTP Release
9.00.1314	September CTP Release
9.00.1399.06	RTM
9.00.1500	HotFix described in the following KB articles: KB #910375 KB #910376 KB #910414 KB #910416 KB #910418 KB #910419
9.00.1502	HotFix described in KB #915793
9.00.1514	HotFix described in KB #912471
9.00.1518	HotFix described in the following KB articles: KB #912322 KB #912439 KB #912472 KB #913371
9.00.2029	SP1 Beta

© 2004-2013 Aaron Bertrand, All Rights Reserved. SQL Server 2005, of course, belongs to Microsoft.