Table: czech_cup_2010_11
Columns: round
clubs_remaining
clubs_involved
winners_from_previous_round
new_entries_this_round
leagues_entering_at_this_round

Question: How many winners from previous round were there in the semi finals?
SQL: SELECT "winners_from_previous_round" FROM czech_cup_2010_11 WHERE "round" = 'Semi finals'

Question: What was the round that had 32 winners from previous round?
SQL: SELECT "round" FROM czech_cup_2010_11 WHERE "winners_from_previous_round" = '32'

Question: How many clubs were remaining in the preliminary round?
SQL: SELECT "clubs_remaining" FROM czech_cup_2010_11 WHERE "round" = 'Preliminary round'

Question: What was the round when there were 16 winners from the previous round?
SQL: SELECT "round" FROM czech_cup_2010_11 WHERE "winners_from_previous_round" = '16'

Question: How many clubs were involved in the second round?
SQL: SELECT "clubs_involved" FROM czech_cup_2010_11 WHERE "round" = 'Second round'