CREATE TABLE table_31015 ("Team" CLOB, "Contest and round" CLOB, "Opponent" CLOB, "1st leg score*" CLOB, "2nd leg score**" CLOB, "Aggregate score" CLOB)

what was the name of the team opponent to elfsborg
SELECT "Team" FROM table_31015 WHERE "Opponent" = 'Elfsborg'
SELECT "Team" FROM "table_31015" WHERE "Opponent" = 'Elfsborg'