PostgreSQL ERROR: function to_tsvector(character varying, unknown) does not exist

Question

This psql session snippet should be self-explanatory:

psql (9.1.7)
Type \"help\" for help.
=> CREATE TABLE languages(language VARCHAR NOT NULL);
CREATE TA         


        

Answer 1

Alternative approach to Erwin Brandstetter's answer

You could define your language column to be of type regconfig which would make your query a bit less verbose i.e.:

CREATE TABLE languages(language regconfig NOT NULL DEFAULT 'english'::regconfig)

I have set english as default above, but that's not required. Afterwards your original query

SELECT language, to_tsvector(language, 'hello world') FROM languages;

would work just fine.