How many people have won the gold medal of the event "Rowing Women's Coxed Eights"?
won the gold medal refers to medal_name = 'Gold'; event "Rowing Women's Coxed Eights" refers to event_name = 'Rowing Women''s Coxed Eights';
SELECT COUNT(T1.competitor_id) FROM competitor_event AS T1 INNER JOIN event AS T2 ON T1.event_id = T2.id INNER JOIN medal AS T3 ON T1.medal_id = T3.id WHERE T2.event_name LIKE 'Rowing Women%s Coxed Eights' AND T3.medal_name = 'Gold'