Table schema:
CREATE TABLE table_12275654_1 (year VARCHAR, mens_singles VARCHAR, womens_singles VARCHAR)

Question: How many times did Niels Christian Kaldau win the men's single and Pi Hongyan win the women's single in the same year?
SQL: SELECT COUNT(year) FROM table_12275654_1 WHERE mens_singles = "Niels Christian Kaldau" AND womens_singles = "Pi Hongyan"