CREATE TABLE "past_winners" (
  "year" real,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text,
  "mixed_doubles" text
);

Question:  how many mens singles with mens doubles being pontus jantti lasse lindelöf
SQL: SELECT COUNT("mens_singles") FROM "past_winners" WHERE "mens_doubles"='Pontus Jantti Lasse Lindelöf';

Question: who is the the mens doubles with mixed doubles being jimm aalto nina sarnesto
SQL: SELECT "mens_doubles" FROM "past_winners" WHERE "mixed_doubles"='Jimm Aalto Nina Sarnesto';

Question: who is the the mixed doubles with year being 1972
SQL: SELECT "mixed_doubles" FROM "past_winners" WHERE "year"=1972;

Question: who is the the mens doubles with year being 1978
SQL: SELECT "mens_doubles" FROM "past_winners" WHERE "year"=1978;

Question: who is the the mens singles with mens doubles being kaj lindfors kaj osterberg
SQL: SELECT "mens_singles" FROM "past_winners" WHERE "mens_doubles"='Kaj Lindfors Kaj Osterberg';