CREATE TABLE table_30328 ("Year Location" TEXT, "Mens Singles" TEXT, "Womens Singles" TEXT, "Mens Doubles" TEXT, "Womens Doubles" TEXT)

Who was the womens double winner when the womens singles winner was Ding Ning?
SELECT "Womens Doubles" FROM table_30328 WHERE "Womens Singles" = 'Ding Ning'
SELECT "Womens Doubles" FROM "table_30328" WHERE "Womens Singles" = 'Ding Ning'