CREATE TABLE "national_junior_champions" (
  "year" real,
  "mens_singles" text,
  "womens_singles" text,
  "men_doubles" text,
  "womens_doubles" text,
  "mixed_doubles" text
);

Question: Name the men doubles for els baert
SQL: SELECT "men_doubles" FROM "national_junior_champions" WHERE "womens_singles"='Els Baert';

Question: Name the men doubles for caroline persyn smids
SQL: SELECT "men_doubles" FROM "national_junior_champions" WHERE "womens_doubles"='Caroline Persyn Smids';

Question: Name the number of men doubles for 2007
SQL: SELECT COUNT("men_doubles") FROM "national_junior_champions" WHERE "year"=2007;