Teradata Tools and Utilities (TTU) 16.00.03 package
is it contains teradata database
what is the username and password for using Teradata SQL assistance.
where can I find the database(demo) for general use.
Go to http://downloads.teradata.com and look at the Database options.
Most people will use Teradata Express for VMware Player
There is also a VMware ESXi developer version available, and an AWS Marketplace offering that allows a trial period with no Teradata license fees (though AWS usage fees will apply).