Table: yugoslav_football_results_9
Columns: date
city
opponent
results
type_of_game

Question: When did Yugoslavia play a friendly game in Belgrade?
SQL: SELECT "date" FROM yugoslav_football_results_9 WHERE "city" = 'belgrade' AND "type_of_game" = 'friendly'

Question: When was the WC 1974 Qualifying game?
SQL: SELECT "date" FROM yugoslav_football_results_9 WHERE "type_of_game" = 'wc 1974 qualifying'

Question: What city did Yugoslavia play Norway in?
SQL: SELECT "city" FROM yugoslav_football_results_9 WHERE "opponent" = 'norway'

Question: Who did Yugoslavia play against that led to a result of 2:3?
SQL: SELECT "opponent" FROM yugoslav_football_results_9 WHERE "results" = '2:3'