CREATE TABLE table_28138035_32 (womens_doubles VARCHAR2, womens_singles VARCHAR2)

Who was the womens double winner when the womens singles winner was Ding Ning?
SELECT womens_doubles FROM table_28138035_32 WHERE womens_singles = "Ding Ning"
SELECT "womens_doubles" FROM "table_28138035_32" WHERE "Ding Ning" = "womens_singles"