Table: player_stats_29
Columns: player
pos
from
school_country
rebs
asts

Question: when did asts reach 0?
SQL: SELECT "from" FROM player_stats_29 WHERE "asts" = 0

Question: beyond 2001, what is the lowest asts from a pos of sf?
SQL: SELECT MIN("asts") FROM player_stats_29 WHERE "pos" = 'sf' AND "from" > 2001