Table: copa_libertadores_1989
Columns: team_1
agg
team_2
1st_leg
2nd_leg

Question: What is the team 2 with cobreloa as team 1?
SQL: SELECT "team_2" FROM copa_libertadores_1989 WHERE "team_1" = 'cobreloa'

Question: What is the team 1 with a 3-0 2nd leg?
SQL: SELECT "team_1" FROM copa_libertadores_1989 WHERE "2nd_leg" = '3-0'

Question: What is the team 1 with a 2-1 2nd leg?
SQL: SELECT "team_1" FROM copa_libertadores_1989 WHERE "2nd_leg" = '2-1'