Question: What is the number of stages where the teams classification leader is Cervélo TestTeam?
SQL: SELECT COUNT("Stage") FROM "1-26010857-13" WHERE "Teams Classification" = 'Cervélo TestTeam';

Question: How many stages did Team Sky lead the teams classification?
SQL: SELECT MAX("Stage") FROM "1-26010857-13" WHERE "Teams Classification" = 'Team Sky';

Question: Who leads the general classification in stage 3?
SQL: SELECT "General Classification" FROM "1-26010857-13" WHERE "Stage" = 3.0;