CREATE TABLE "knockout_stages" (
  "home_1st_leg" text,
  "home_2nd_leg" text,
  "1st_leg" text,
  "2nd_leg" text,
  "aggregate" text
);

Question: What was the score of the 2nd leg when Newell's Old Boys played at home?
SQL: SELECT "2nd_leg" FROM "knockout_stages" WHERE "home_2nd_leg"='newell''s old boys';

Question: Who played at home for the second leg, with a score of 1-1 on the first leg and an aggregate score of 2-4?
SQL: SELECT "home_2nd_leg" FROM "knockout_stages" WHERE "1st_leg"='1-1' AND "aggregate"='2-4';

Question: Which team played at home for the second leg and has aggregate score of 2-0?
SQL: SELECT "home_2nd_leg" FROM "knockout_stages" WHERE "aggregate"='2-0';

Question: What was the score on the first leg when gimnasia de mendoza played at home for the second leg?
SQL: SELECT "1st_leg" FROM "knockout_stages" WHERE "home_2nd_leg"='gimnasia de mendoza';

Question: Which team played at home for the second leg and has an aggregate score of 2-4?
SQL: SELECT "home_2nd_leg" FROM "knockout_stages" WHERE "aggregate"='2-4';

Question: What was the 2nd leg score when atlético tucumán played at home?
SQL: SELECT "2nd_leg" FROM "knockout_stages" WHERE "home_2nd_leg"='atlético tucumán';