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 table_name_86 (points INTEGER, goals_for VARCHAR, goal_difference VARCHAR, club VARCHAR)

### Question ###
what is the average points when the goal difference is less than 17, the club is getafe cf and the goals for is more than 30?

### Accurate SQL ###

SELECT AVG(points) FROM table_name_86 WHERE goal_difference < 17 AND club = "getafe cf" AND goals_for > 30