Table: djurgardens_if_2005
Columns: date
venue
opponents
score
comp
attendance

Question: Who was the opponent at Ullevi?
SQL: SELECT "opponents" FROM djurgardens_if_2005 WHERE "venue" = 'ullevi'

Question: When was Göteborg the opponent with a score of 3-1?
SQL: SELECT "date" FROM djurgardens_if_2005 WHERE "opponents" = 'göteborg' AND "score" = '3-1'