Table: argentina_85_match
Columns: home_1st_leg
home_2nd_leg
1st_leg
2nd_leg
aggregate

Question: What was the 2nd leg that had a first leg of 1-1?
SQL: SELECT "home_2nd_leg" FROM argentina_85_match WHERE "1st_leg" = '1-1'

Question: What was the first leg home that had a total aggregate of 3-1?
SQL: SELECT "home_1st_leg" FROM argentina_85_match WHERE "aggregate" = '3-1'

Question: What was the 1st leg that had a 4-2 aggregate?
SQL: SELECT "1st_leg" FROM argentina_85_match WHERE "aggregate" = '4-2'

Question: What was the 1st leg that had a 1st get home for the Boca Juniors?
SQL: SELECT "1st_leg" FROM argentina_85_match WHERE "home_1st_leg" = 'boca juniors'

Question: What was the 2nd leg that had the Estudiantes La Plata home for the 2nd leg?
SQL: SELECT "2nd_leg" FROM argentina_85_match WHERE "home_2nd_leg" = 'estudiantes la plata'