Table: maltese_badminton_champs
Columns: year
men_s_singles
women_s_singles
men_s_doubles
women_s_doubles
mixed_doubles

Question: In what year did Carmen Worley win in the women's singles category?
SQL: SELECT "year" FROM maltese_badminton_champs WHERE "women_s_singles" = 'carmen worley'

Question: Who won in the men's doubles in 1980?
SQL: SELECT "men_s_doubles" FROM maltese_badminton_champs WHERE "year" = '1980'

Question: Who won in mixed doubles in 2008?
SQL: SELECT "mixed_doubles" FROM maltese_badminton_champs WHERE "year" = '2008'

Question: Who won women's double in 2002, the year that Kenneth Vella won men's singles?
SQL: SELECT "women_s_doubles" FROM maltese_badminton_champs WHERE "men_s_singles" = 'kenneth vella' AND "year" = '2002'