Still a lot of great responses coming in. But I haven't seen a direct response to the fascinating question by Michael Valentine Jones:
Are there any set based languages besides SQL?
These two sound like possible candidates, but I am very curious to hear from people who have more expert knowledge on this topic.
http://readwrite.com/2011/07/01/new-set-based-programming-language-bandicoot
http://en.wikipedia.org/wiki/Claire_%28programming_language%29
- webrunner
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A SQL query walks into a bar and sees two tables. He walks up to them and asks, "Can I join you?"
Ref.: http://tkyte.blogspot.com/2009/02/sql-joke.html