PostgreSQL 8.4 no levenshtein fuzzymatching? I'm using debian squeeze package, it says function does not exist?
You have to install the additional module fuzzystrmatch.

In PostgreSQL 9.1 or later, simply run CREATE EXTENSION once per database:

CREATE EXTENSION fuzzystrmatch;


In PostgreSQL 8.4 on Debian Squeeze, you would run as OS postgres matching the DB superuser postgres (so with peer authentication without PW) the SQL script provided by the package postgresql-contrib-8.4 (install that if you haven't already):

sudo -u postgres psql mydb -f /usr/share/postgresql/8.4/contrib/fuzzystrmatch.sql


About CREATE EXTENSION:


Do I need to execute &quot;create extension pgcrypto&quot; everytime?