If you say "SQL" and "SQL Server" as part your knowledge set, I'd say you know T-SQL. Do you know the new 2012 paging methods? I'm not up on those, so does that mean I don't know SQL or T-SQL? No, I just don't have that construct in my toolbelt yet. But unless we're discussing PL/SQL vs. T-SQL or ANSI SQL vs. T-SQL, then saying SQL when referring to SQL Server is the same as saying T-SQL. But it never hurts to be clear. I do try, most of the time, to type T-SQL when referring to SQL Server, just for clarity.