CREATE TABLE table_15001681_1 (mixed_doubles VARCHAR2, womens_singles VARCHAR2, mens_singles VARCHAR2)

In 2001, where the mens singles is armand jehle and the womens singles is michaela ritter, who are the mixed doubles
SELECT mixed_doubles FROM table_15001681_1 WHERE womens_singles = "Michaela Ritter" AND mens_singles = "Armand Jehle"
SELECT "mixed_doubles" FROM "table_15001681_1" WHERE "Armand Jehle" = "mens_singles" AND "Michaela Ritter" = "womens_singles"