CREATE TABLE "past_winners" (
  "year" real,
  "men_s_singles" text,
  "women_s_singles" text,
  "men_s_doubles" text,
  "women_s_doubles" text,
  "mixed_doubles" text
);

Question: Name the men's singles for christian wagener christian esch
SQL: SELECT "men_s_singles" FROM "past_winners" WHERE "men_s_doubles"='christian wagener christian esch';

Question: Name the total numbe rof years for gaby weissen mireille kosmala
SQL: SELECT COUNT("year") FROM "past_winners" WHERE "women_s_doubles"='gaby weissen mireille kosmala';

Question: Name the mixed doubles with martine ludwig angele da cruz, and men's doubles of christian wagener christian esch
SQL: SELECT "mixed_doubles" FROM "past_winners" WHERE "women_s_doubles"='martine ludwig angele da cruz' AND "men_s_doubles"='christian wagener christian esch';