I'm trying to use the similarity function in Postgres to do some fuzzy text matching, however whenever I try to use it I get the error:
function similarity(character varying, unknown) does not exist
If I add explicit casts to text I get the error:
function similarity(text, text) does not exist
My query is:
SELECT (similarity("table"."field"::text, %s::text)) AS "similarity", "table".* FROM "table" WHERE similarity > .5 ORDER BY "similarity" DESC LIMIT 10
Do I need to do something to initalize pg_trgm?
With postgresql 9.1:
after installing (on ubuntu) sudo apt-get install postgresql-contrib
as tomaszbak answered.
you just have to execute the sql command:
CREATE EXTENSION pg_trgm;