Table: argentinian_football_stats_3
Columns: team
average
points
played
1989_90
1990_91
1991_1992

Question: Name the least points where 1989-90 is 31
SQL: SELECT MIN("points") FROM argentinian_football_stats_3 WHERE "1989_90" = '31'

Question: Name the 1991-1992 for river plate
SQL: SELECT "1991_1992" FROM argentinian_football_stats_3 WHERE "team" = 'River Plate'