Table: f1_1963_race_results
Columns: col
race_name
circuit
date
winning_driver
constructor
report

Question: What date is listed at place 13
SQL: SELECT "date" FROM f1_1963_race_results WHERE "col" = 13

Question: What date has a solitudering circuit
SQL: SELECT "date" FROM f1_1963_race_results WHERE "circuit" = 'Solitudering'

Question: How many dates have silverstone circuit
SQL: SELECT COUNT("date") FROM f1_1963_race_results WHERE "circuit" = 'Silverstone'

Question: How many constructors are listed for the XVI BRDC international trophy race
SQL: SELECT COUNT("constructor") FROM f1_1963_race_results WHERE "race_name" = 'XVI BRDC International Trophy'