CREATE TABLE "classification_leadership" (
  "stage" text,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "young_rider_classification" text,
  "team_classification" text
);

Question: What Young rider classification has a Stage of 18?
SQL: SELECT "young_rider_classification" FROM "classification_leadership" WHERE "stage"='18';

Question: Who has a Team classification of la vie claire, a stage of 20, a General classification of greg lemond?
SQL: SELECT "winner" FROM "classification_leadership" WHERE "team_classification"='la vie claire' AND "general_classification"='greg lemond' AND "stage"='20';

Question: What is the classification with a Team classification of la vie claire and a Stage of 12?
SQL: SELECT "general_classification" FROM "classification_leadership" WHERE "team_classification"='la vie claire' AND "stage"='12';

Question: What is guido bontempi's general classification when he has a stage of 6?
SQL: SELECT "general_classification" FROM "classification_leadership" WHERE "winner"='guido bontempi' AND "stage"='6';

Question: What is Ludo Peeters' team classification?
SQL: SELECT "team_classification" FROM "classification_leadership" WHERE "winner"='ludo peeters';