CREATE TABLE "appearances_in_tour_de_france_since_1947" (
  "year" real,
  "stage" real,
  "start" text,
  "finish" text,
  "leader_at_the_summit" text
);

Question: Who was the leader at the summit earlier than 1956, when Carcassonne shows for finish?
SQL: SELECT "leader_at_the_summit" FROM "appearances_in_tour_de_france_since_1947" WHERE "year"<1956 AND "finish"='carcassonne';

Question: What year was finish Toulouse, and stage was larger than 12?
SQL: SELECT SUM("year") FROM "appearances_in_tour_de_france_since_1947" WHERE "finish"='toulouse' AND "stage">12;

Question: What is the highest stage number for a year later than 1948, leader at the summit was group, and finish was Bagnères-De-Bigorre?
SQL: SELECT MAX("stage") FROM "appearances_in_tour_de_france_since_1947" WHERE "year">1948 AND "leader_at_the_summit"='group' AND "finish"='bagnères-de-bigorre';