See the docs for: citext: http://www.postgresql.org/docs/9.2/static/citext.html http://www.postgresql.org/docs/9.2/static/citext.html unaccent: http://www.pos

See the docs for: citext: http://www.postgresql.org/docs/9.2/static/citext.html http://www.postgresql.org/docs/9.2/static/citext.html unaccent: http://www.postgresql.org/docs/9.2/static/unaccent.html http://www.postgresql.org/docs/9.2/static/unaccent.html I think you can make it work.