Question: Who won the mens doubles at the 2006 Guangzhou event?
SQL: SELECT "Mens Doubles" FROM "1-28138035-6" WHERE "Year Location" = '2006 Guangzhou';

Question: How many times was the womens doubles in China?
SQL: SELECT COUNT("Mens Singles") FROM "1-28138035-6" WHERE "Womens Doubles" = 'China';

Question: How many times did  Li Ju win the womens singles and Wang Liqin win the mens singles?
SQL: SELECT COUNT("Womens Doubles") FROM "1-28138035-6" WHERE "Womens Singles" = 'Li Ju' AND "Mens Singles" = 'Wang Liqin';