Table: chinese_taipei_open_tennis
Columns: year
men_s_singles
women_s_singles
women_s_doubles
mixed_doubles

Question: Who participated in the Mixed Doubles when Tracey Hallam participated in the Women's Singles?
SQL: SELECT "mixed_doubles" FROM chinese_taipei_open_tennis WHERE "women_s_singles" = 'tracey hallam'

Question: Who participated in the Mixed Doubles when Simon Santoso participated in the Men's Singles after 2008?
SQL: SELECT "mixed_doubles" FROM chinese_taipei_open_tennis WHERE "men_s_singles" = 'simon santoso' AND "year" > 2008