We are currently deploying a new user interface and navigational structure on our Community. These design changes align with our new Teradata Access portal and provide a more cohesive experience for our users.
The latest SQL standard, (SQL:2003, soon to be superseded by SQL:2008) is vast. Teradata implements a very large subset (perhaps 95%) of the SQL:2003 Core language as defined by the standard, which is on a par with the other major RDBMS vendors. At present, there isn't any public document that provides a concise summary of the outstanding differences between Teradata and the standard, but you can get detailed compliance information from the Teradata SQL Reference manual.