Table: us_open_badminton_champs
Columns: year
men_s_singles
women_s_singles
men_s_doubles
women_s_doubles
mixed_doubles

Question: Who was the women's singles champion in 1984?
SQL: SELECT "women_s_singles" FROM us_open_badminton_champs WHERE "year" = '1984'

Question: Who were the men's doubles champions when the men's singles champion was muljadi?
SQL: SELECT "men_s_doubles" FROM us_open_badminton_champs WHERE "men_s_singles" = 'muljadi'