Table: draft_picks_41
Columns: round
pick
player
position
school_club_team

Question: Name the Round which has a Position of defensive back and a Pick of 226?
SQL: SELECT MIN("round") FROM draft_picks_41 WHERE "position" = 'defensive back' AND "pick" = 226

Question: Name the Round which has a Player of zack walz?
SQL: SELECT "round" FROM draft_picks_41 WHERE "player" = 'zack walz'

Question: Name the Round which has a Position of defensive back and corey chavous?
SQL: SELECT MIN("round") FROM draft_picks_41 WHERE "position" = 'defensive back' AND "player" = 'corey chavous'

Question: Name all Pick that has a Round of 7, and a School/Club Team of arizona st.?
SQL: SELECT COUNT("pick") FROM draft_picks_41 WHERE "round" = 7 AND "school_club_team" = 'arizona st.'