What is the lowest goal difference of club real betis, who has less than 18 wins?
CREATE TABLE table_name_10 (goal_difference INTEGER, club VARCHAR, wins VARCHAR)
SELECT MIN(goal_difference) FROM table_name_10 WHERE club = "real betis" AND wins < 18
### Context: CREATE TABLE table_name_10 (goal_difference INTEGER, club VARCHAR, wins VARCHAR) ### Question: What is the lowest goal difference of club real betis, who has less than 18 wins? ### Answer: SELECT MIN(goal_difference) FROM table_name_10 WHERE club = "real betis" AND wins < 18