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

Question: What is the number of stages where the teams classification leader is Cervélo Testteam?
SQL: SELECT COUNT("stage") FROM "classification_leadership" WHERE "teams_classification"='Cervélo TestTeam';

Question: How many stages did Team Sky lead the teams classification?
SQL: SELECT MAX("stage") FROM "classification_leadership" WHERE "teams_classification"='Team Sky';

Question: Who leads the general classification in stage 3?
SQL: SELECT "general_classification" FROM "classification_leadership" WHERE "stage"=3;