Table: football_matches
Columns: date
location
opponent
score
competition

Question: When was the event that had Liberia as an opponent and resulted in a 1-0 score?
SQL: SELECT "date" FROM football_matches WHERE "opponent" = 'liberia' AND "score" = '1-0'

Question: When was the 2014 World Cup Qualification in Kampala that had Angola as an opponent
SQL: SELECT "date" FROM football_matches WHERE "competition" = '2014 world cup qualification' AND "location" = 'kampala' AND "opponent" = 'angola'