How many athletes competed in the 1992 Summer Olympics?
1992 Summer Olympics refer to games_name = '1928 Summer';
SELECT COUNT(T2.person_id) FROM games AS T1 INNER JOIN games_competitor AS T2 ON T1.id = T2.games_id WHERE T1.games_name = '1928 Summer'
database name:db_id olympics
city table city Cols: id dtype integer, city name dtype text, 
games table games Cols: id dtype integer, games year dtype integer, games name dtype text, season dtype text, 
games_city table games_city Cols: games id dtype integer, city id dtype integer, 
medal table medal Cols: id dtype integer, medal name dtype text, 
noc_region table noc_region Cols: id dtype integer, noc dtype text, region name dtype text, 
person table person Cols: id dtype integer, full name dtype text, gender dtype text, height dtype integer, weight dtype integer, 
games_competitor table games_competitor Cols: id dtype integer, games id dtype integer, person id dtype integer, age dtype integer, 
person_region table person_region Cols: person_id dtype integer, region_id dtype integer, 
sport table sport Cols: id dtype integer, sport name dtype text, 
event table event Cols: id dtype integer, sport id dtype integer, event name dtype text, 
competitor_event table competitor_event Cols: event id dtype integer, competitor id dtype integer, medal id dtype integer, 
