Table: draft_picks_9
Columns: year
pick
player_name
position
college

Question: I want the sum of year for mark barron
SQL: SELECT SUM("year") FROM draft_picks_9 WHERE "player_name" = 'mark barron'

Question: Tell me the year for defensive tackle and college of lsu
SQL: SELECT "year" FROM draft_picks_9 WHERE "position" = 'defensive tackle' AND "college" = 'lsu'