Question: Which of the two teams has 1st leg of 2-0?
SQL: SELECT "Team 2" FROM "2-12423174-1" WHERE "1st leg" = '2-0';

Question: Which team has an agg., that has a 1st leg of 1-2?
SQL: SELECT "Agg." FROM "2-12423174-1" WHERE "1st leg" = '1-2';

Question: Which team of the team 1 column, has a 2nd leg of 1-0?
SQL: SELECT "Team 1" FROM "2-12423174-1" WHERE "2nd leg" = '1-0';