I think it is, particularly when including extensions like Transact-Sql and PL/SQL, but you can't write a whole useful application in it, so it probably shouldn't be on the list. (I use a lot of SQL, but I didn't vote for it.)
Fine, so it's not a Turing-complete programming language, big fat hairy deal.
(Note to self: Look up Turing-complete programming languages, cross reference to my telnet scripting language.)
Wikipedia also says: "1999 SQL:1999 SQL3 Added regular expression matching, recursive queries, triggers, support for procedural and control-of-flow statements, non-scalar types, and some object-oriented features."