Table: croatian_badminton_champs
Columns: year
mens_singles
womens_singles
mens_doubles
womens_doubles
mixed_doubles

Question: What was the competition when there was no competition for mens doubles?
SQL: SELECT "womens_doubles" FROM croatian_badminton_champs WHERE "mens_doubles" = 'No competition'

Question: Who won the mixed doubles in 1998?
SQL: SELECT "mixed_doubles" FROM croatian_badminton_champs WHERE "year" = 1998