Question: What is the ratio male to female athletes in the 2012 Summer Olympic?
SQL: SELECT CAST(COUNT(CASE WHEN T3.gender = 'M' THEN 1 ELSE NULL END) AS REAL) / COUNT(CASE WHEN T3.gender = 'F' THEN 1 ELSE NULL END) FROM games AS T1 INNER JOIN games_competitor AS T2 ON T1.id = T2.games_id INNER JOIN person AS T3 ON T2.person_id = T3.id WHERE T1.games_name = '2012 Summer'