Table: finnish_badminton_champs
Columns: year
men_s_singles
women_s_singles
men_s_doubles
women_s_doubles
mixed_doubles

Question: What is the women's singles before 1965 with kaj lindfors ann-louise von essen being mixed doubles?
SQL: SELECT "women_s_singles" FROM finnish_badminton_champs WHERE "year" < 1965 AND "mixed_doubles" = 'kaj lindfors ann-louise von essen'

Question: When did mika heinonen susanna dahlberg win mixed doubles?
SQL: SELECT AVG("year") FROM finnish_badminton_champs WHERE "mixed_doubles" = 'mika heinonen susanna dahlberg'

Question: How many years did pia pajunen nina sundberg win women's doubles?
SQL: SELECT COUNT("year") FROM finnish_badminton_champs WHERE "women_s_doubles" = 'pia pajunen nina sundberg'

Question: Who won women's singles in 1961?
SQL: SELECT "women_s_singles" FROM finnish_badminton_champs WHERE "year" = 1961