Table: ittf_tour_winners
Columns: year_location
mens_singles
womens_singles
mens_doubles
womens_doubles

Question: Who won in the men singles group in the year when Yoshie Takada won in the women singles?
SQL: SELECT "mens_singles" FROM ittf_tour_winners WHERE "womens_singles" = 'Yoshie Takada'

Question: When and where did Chen Qi win in men singles?
SQL: SELECT "year_location" FROM ittf_tour_winners WHERE "mens_singles" = 'Chen Qi'