Table: ittf_pro_tour_winners_2
Columns: year_location
mens_singles
womens_singles
mens_doubles
womens_doubles

Question: Who won the mens doubles when wu yang won the womens singles?
SQL: SELECT "mens_doubles" FROM ittf_pro_tour_winners_2 WHERE "womens_singles" = 'Wu Yang'

Question: What year and where was the tournament when fan ying won the womens singles?
SQL: SELECT "year_location" FROM ittf_pro_tour_winners_2 WHERE "womens_singles" = 'Fan Ying'

Question: Who won the mens singles when lau sui fei won the womens singles?
SQL: SELECT "mens_singles" FROM ittf_pro_tour_winners_2 WHERE "womens_singles" = 'Lau Sui Fei'

Question: Who won the mens doubles when wang hao won the mens singles?
SQL: SELECT "mens_doubles" FROM ittf_pro_tour_winners_2 WHERE "mens_singles" = 'Wang Hao'