CREATE TABLE table_12275654_1 (year VARCHAR2, mens_singles VARCHAR2, womens_singles VARCHAR2)

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