Table: ittf_pro_tour_winners_2
Columns: year_location
mens_singles
womens_singles
mens_doubles
womens_doubles

Question: What is the place and when was the year when the women's doubles womens were Bai yang Niu Jianfeng?
SQL: SELECT "year_location" FROM ittf_pro_tour_winners_2 WHERE "womens_doubles" = 'Bai Yang Niu Jianfeng'

Question: How many times has Ma Long won the men's singles?
SQL: SELECT COUNT("mens_doubles") FROM ittf_pro_tour_winners_2 WHERE "mens_singles" = 'Ma Long'

Question: How many times has Sun Jin won the women's doubles?
SQL: SELECT COUNT("mens_doubles") FROM ittf_pro_tour_winners_2 WHERE "womens_singles" = 'Sun Jin'