Table: race_results_1967
Columns: race_name
circuit
date
winning_driver
constructor
report

Question: What company constrcuted the vehicle with a circuit of oulton park on 15 april?
SQL: SELECT "constructor" FROM race_results_1967 WHERE "circuit" = 'oulton park' AND "date" = '15 april'

Question: What is the name of the race on 16 september?
SQL: SELECT "race_name" FROM race_results_1967 WHERE "date" = '16 september'

Question: What is the circuit held on 15 april?
SQL: SELECT "circuit" FROM race_results_1967 WHERE "date" = '15 april'

Question: What date was the xiv international gold cup?
SQL: SELECT "date" FROM race_results_1967 WHERE "race_name" = 'xiv international gold cup'