CREATE TABLE table_name_18 (losses INT, wins VARCHAR, against VARCHAR, club VARCHAR)

What are the least losses of Warrnambool with more than 6 wins and less than 630 against?
SELECT MIN(losses) FROM table_name_18 WHERE against < 630 AND club = "warrnambool" AND wins > 6
SELECT MIN("losses") FROM "table_name_18" WHERE "against" < 630 AND "club" = "warrnambool" AND "wins" > 6