Question: What is the venue established after 1948?
SQL: SELECT "Venue" FROM "2-18642444-7" WHERE "Established" > 1948.0;

Question: What is the league established before 1930 with the Rayo Vallecano club?
SQL: SELECT "League" FROM "2-18642444-7" WHERE "Established" < 1930.0 AND "Club" = 'Rayo Vallecano';

Question: What sport is the Rayo Vallecano club in?
SQL: SELECT "Sport" FROM "2-18642444-7" WHERE "Club" = 'Rayo Vallecano';

Question: What sport is the CB Estudiantes club in?
SQL: SELECT "Sport" FROM "2-18642444-7" WHERE "Club" = 'CB Estudiantes';