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_18 ( losses INTEGER, wins VARCHAR, against VARCHAR, club VARCHAR )

### Question ###
What are the least losses of Warrnambool with more than 6 wins and less than 630 against?

### Accurate SQL ###

SELECT MIN(losses) FROM table_name_18 WHERE against < 630 AND club = "warrnambool" AND wins > 6