Sure it is:
http://wiki.postgresql.org/wiki/Mandelbrot_set
http://assets.en.oreilly.com/1/event/27/High%20Performance%2...
Okay, so SQL isn't a general-purpose programming language. It's not Turing complete, either. But I wouldn't go so far to say it's not a programming language. It's a domain-specific language used for programming. I believe that makes it a programming language. Not one I like too much, but a programming language nevertheless.
As for languages selection - I considered adding assembly, F#, ML, Fortran, Algol and some others, but I had to stop somewhere. I combined the options in DZone with GitHub top, and added a few other names.
SQL was explicitly requested in the previous discussion, so I added it. Groovy scored above Lisp and ObjC in DZone's survey, so it's in the poll as well.
C/Pascal/Delphi are not so different from each other. C++/Java/C# are not so different from each other. PHP/Python/Ruby/Perl/Lua/JavaScript/Shell are not so different from each other. Arc/Scheme are not so different from each other.
You've neglected the APL family of languages. You've neglected the Prolog family of languages. You've neglected the Forth family of languages. You've neglected languages in the family of theorem provers, such as Coq, Agda and ATS.
You've also made some other strange choices. Scala and OCaml but not Standard ML? Smalltalk and C++ but not Simula? Groovy, which nobody will remember in three years, but not Fortran, a timeless classic still in wide use today?