CREATE TABLE temperature (city_id NUMBER, jan NUMBER, feb NUMBER, mar NUMBER, apr NUMBER, jun NUMBER, jul NUMBER, aug NUMBER, sep NUMBER, oct NUMBER, nov NUMBER, dec NUMBER)
CREATE TABLE match (match_id NUMBER, date CLOB, venue CLOB, score CLOB, result CLOB, competition CLOB)
CREATE TABLE city (city_id NUMBER, city CLOB, hanzi CLOB, hanyu_pinyin CLOB, regional_population NUMBER, gdp NUMBER)
CREATE TABLE hosting_city (year NUMBER, match_id NUMBER, host_city CLOB)

Which city has hosted the most events?
SELECT T1.city FROM city AS T1 JOIN hosting_city AS T2 ON T1.city_id = T2.host_city GROUP BY T2.host_city ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T1"."city" FROM "city" "T1" JOIN "hosting_city" "T2" ON "T1"."city_id" = "T2"."host_city" GROUP BY "T2"."host_city" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY