Who is the youngest competitor that participated in 2014 Winter?
the youngest competitor refers to full_name where MIN(age); in 2014 Winter refers to games_name = '2014 Winter';
SELECT T3.full_name 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 = '2014 Winter' ORDER BY T2.age LIMIT 1