CREATE TABLE table_name_56 (spectators NUMBER, date VARCHAR2, time_cet_ VARCHAR2)

Tell me the average spectators for 2006-06-21 and time more than 21
SELECT AVG(spectators) FROM table_name_56 WHERE date = "2006-06-21" AND time_cet_ > 21
SELECT AVG("spectators") FROM "table_name_56" WHERE "2006-06-21" = "date" AND "time_cet_" > 21