Table: norwegian_football_2011
Columns: team
contest_and_round
opponent
1st_leg_score
2nd_leg_score
aggregate_score

Question: what was the name of the team opponent to elfsborg
SQL: SELECT "team" FROM norwegian_football_2011 WHERE "opponent" = 'Elfsborg'

Question: what is the score in the 1st leg where the contest and round was in europa league play off round
SQL: SELECT COUNT("1st_leg_score") FROM norwegian_football_2011 WHERE "contest_and_round" = 'Europa League Play Off Round'

Question: what is the name of the team which aggregate score is l 1–2
SQL: SELECT "team" FROM norwegian_football_2011 WHERE "aggregate_score" = 'L 1–2'

Question: what is the aggregate score for the europa league play off round contest and round
SQL: SELECT "aggregate_score" FROM norwegian_football_2011 WHERE "contest_and_round" = 'Europa League Play Off Round'