CREATE TABLE country (Country_name VARCHAR2, Country_id VARCHAR2)
CREATE TABLE match_season (Country VARCHAR2, Position VARCHAR2)

What are the names of countries that have both players with position forward and players with position defender?
SELECT T1.Country_name FROM country AS T1 JOIN match_season AS T2 ON T1.Country_id = T2.Country WHERE T2.Position = "Forward" INTERSECT SELECT T1.Country_name FROM country AS T1 JOIN match_season AS T2 ON T1.Country_id = T2.Country WHERE T2.Position = "Defender"
SELECT "T1"."Country_name" FROM "country" "T1" JOIN "match_season" "T2" ON "Forward" = "T2"."Position" AND "T1"."Country_id" = "T2"."Country" INTERSECT SELECT "T1"."Country_name" FROM "country" "T1" JOIN "match_season" "T2" ON "Defender" = "T2"."Position" AND "T1"."Country_id" = "T2"."Country"