What grand prixs did Daijiro Hiura win? 
CREATE TABLE table_18303274_1 (grand_prix VARCHAR, race_winner VARCHAR)
SELECT grand_prix FROM table_18303274_1 WHERE race_winner = "Daijiro Hiura"
### Context: CREATE TABLE table_18303274_1 (grand_prix VARCHAR, race_winner VARCHAR) ### Question: What grand prixs did Daijiro Hiura win?  ### Answer: SELECT grand_prix FROM table_18303274_1 WHERE race_winner = "Daijiro Hiura"