Table: bulgarian_badminton_champs
Columns: year
mens_singles
womens_singles
mens_doubles
womens_doubles
mixed_doubles

Question: Name the womens singles for  raina tzvetkova petya nedelcheva
SQL: SELECT "womens_singles" FROM bulgarian_badminton_champs WHERE "womens_doubles" = 'Raina Tzvetkova Petya Nedelcheva'

Question: Name the number of years for womens doubles being  diana koleva emilia dimitrova and  jeliazko valkov
SQL: SELECT COUNT("year") FROM bulgarian_badminton_champs WHERE "womens_doubles" = 'Diana Koleva Emilia Dimitrova' AND "mens_singles" = 'Jeliazko Valkov'

Question: Name the mens singles for  jeliazko valkov dobrinka peneva
SQL: SELECT "mens_singles" FROM bulgarian_badminton_champs WHERE "mixed_doubles" = 'Jeliazko Valkov Dobrinka Peneva'

Question: Name the mens singles for 1989
SQL: SELECT "mens_singles" FROM bulgarian_badminton_champs WHERE "year" = 1989

Question: Name the year for victoria hristova neli nedialkova
SQL: SELECT "year" FROM bulgarian_badminton_champs WHERE "womens_doubles" = 'Victoria Hristova Neli Nedialkova'

Question: Name the year for womens doubles being raina tzvetkova emilia dimitrova
SQL: SELECT "year" FROM bulgarian_badminton_champs WHERE "womens_doubles" = 'Raina Tzvetkova Emilia Dimitrova'