Table: draft_picks_2007_2
Columns: round
pick
player
nationality
school

Question: What is the mean pick when the play is Marc Lewis (lhp) and the round is less than 20?
SQL: SELECT AVG("pick") FROM draft_picks_2007_2 WHERE "player" = 'marc lewis (lhp)' AND "round" < 20

Question: Which pick's player was Marc Lewis (lhp)?
SQL: SELECT "pick" FROM draft_picks_2007_2 WHERE "player" = 'marc lewis (lhp)'

Question: Which is the biggest pick for Naperville Central High School?
SQL: SELECT MAX("pick") FROM draft_picks_2007_2 WHERE "school" = 'naperville central high school'