Table: race_results_29
Columns: round
circuit
date
pole_position
fastest_lap
winning_rider
winning_team

Question: Who was in the pole position for knockhill?
SQL: SELECT "pole_position" FROM race_results_29 WHERE "circuit" = 'Knockhill'

Question: How many dates was knockhill?
SQL: SELECT COUNT("date") FROM race_results_29 WHERE "circuit" = 'Knockhill'