Table: nz_open_badminton_2
Columns: year
men_s_singles
women_s_singles
men_s_doubles
women_s_doubles
mixed_doubles

Question: When did Deng Xuan first win Women's singles?
SQL: SELECT MIN("year") FROM nz_open_badminton_2 WHERE "women_s_singles" = 'deng xuan'

Question: When did Julie Still first win Women's singles?
SQL: SELECT MIN("year") FROM nz_open_badminton_2 WHERE "women_s_singles" = 'julie still'