Question: Who is listed under mens singles when womens has Wang Nan Zhang Yining?
SQL: SELECT "Mens Singles" FROM "1-28138035-27" WHERE "Womens Doubles" = 'Wang Nan Zhang Yining';

Question: How many womens singles entries are there when womens doubles is Li Xiaodan Wen Jia?
SQL: SELECT COUNT("Womens Singles") FROM "1-28138035-27" WHERE "Womens Doubles" = 'Li Xiaodan Wen Jia';

Question: Who is listed under womens singles when year location is 1998 Doha?
SQL: SELECT "Womens Singles" FROM "1-28138035-27" WHERE "Year Location" = '1998 Doha';

Question: Who is listed under mens singles when the year location is 2009 Doha?
SQL: SELECT "Mens Singles" FROM "1-28138035-27" WHERE "Year Location" = '2009 Doha';