Table: hughes_hall_boat_club
Columns: year
finish_position
1st_day
2nd_day
3rd_day
4th_day

Question: How many years have a 4th Day of bumped wolfson?
SQL: SELECT COUNT("year") FROM hughes_hall_boat_club WHERE "4th_day" = 'bumped wolfson'

Question: Which 3rd day has a 4th Day of rowed-over, and a Finish position of 55th?
SQL: SELECT "3rd_day" FROM hughes_hall_boat_club WHERE "4th_day" = 'rowed-over' AND "finish_position" = '55th'

Question: Which Finish position has a 4th Day of bumped robinson?
SQL: SELECT "finish_position" FROM hughes_hall_boat_club WHERE "4th_day" = 'bumped robinson'

Question: Which 1st day has a 3rd day of bumped 1st & 3rd trinity?
SQL: SELECT "1st_day" FROM hughes_hall_boat_club WHERE "3rd_day" = 'bumped 1st & 3rd trinity'