How to make unique random alphanumeric sequence in SQL Server

Question

I want to make unique random alphanumeric sequence to be the primary key for a database table.

Each char in the sequence is either a letter (a-z) or number (0-9)

Answer 1

You can use an uniqueidentifier. This can be generated with the NEWID() function:

SELECT NEWID()

will return something like:

BE228C22-C18A-4B4A-9AD5-1232462F7BA9