Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE player ( player_id number, name text, position text, club_id number, apps number, tries number, goals text, points number )
TABLE: CREATE TABLE club_rank ( rank number, club_id number, gold number, silver number, bronze number, total number )
TABLE: CREATE TABLE club ( club_id number, name text, region text, start_year text )
TABLE: CREATE TABLE competition_result ( competition_id number, club_id_1 number, club_id_2 number, score text )
TABLE: CREATE TABLE competition ( competition_id number, year number, competition_type text, country text )

### Question ###
What is the average number of gold medals for a club?

### Accurate SQL ###

SELECT AVG(gold) FROM club_rank