SELECT COUNT(year) FROM table_12275654_1 WHERE mens_singles = "Niels Christian Kaldau" AND womens_singles = "Pi Hongyan"
Berapa kali Niels Christian Kaldau memenangkan lajang putra dan Pi Hongyan memenangkan single wanita di tahun yang sama?
CREATE TABLE table_12275654_1 (year VARCHAR, mens_singles VARCHAR, womens_singles VARCHAR)