CREATE TABLE table_55591 ("Team 1" TEXT, "Agg." TEXT, "Team 2" TEXT, "1st leg" TEXT, "2nd leg" TEXT)

When Team 1 is Aalborg BK, what is the 1st Leg?
SELECT "1st leg" FROM table_55591 WHERE "Team 1" = 'aalborg bk'
SELECT "1st leg" FROM "table_55591" WHERE "Team 1" = 'aalborg bk'