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 hosting_city (year NUMBER, match_id NUMBER, host_city CLOB)
CREATE TABLE city (city_id NUMBER, city CLOB, hanzi CLOB, hanyu_pinyin CLOB, regional_population NUMBER, gdp NUMBER)
CREATE TABLE match (match_id NUMBER, date CLOB, venue CLOB, score CLOB, result CLOB, competition CLOB)

Give me a list of cities whose temperature in Feb is higher than that in Jun or cities that were once host cities?
SELECT T1.city FROM city AS T1 JOIN temperature AS T2 ON T1.city_id = T2.city_id WHERE T2.feb > T2.jun UNION SELECT T3.city FROM city AS T3 JOIN hosting_city AS T4 ON T3.city_id = T4.host_city
SELECT "T1"."city" FROM "city" "T1" JOIN "temperature" "T2" ON "T1"."city_id" = "T2"."city_id" AND "T2"."feb" > "T2"."jun" UNION SELECT "T3"."city" FROM "city" "T3" JOIN "hosting_city" "T4" ON "T3"."city_id" = "T4"."host_city"