Question: If the mountains classification is Mathias Frank, and the General Classification is Fabian Cancellara, what is the Points classification?
SQL: SELECT "Points classification" FROM "1-27573848-18" WHERE "General classification" = 'Fabian Cancellara' AND "Mountains Classification" = 'Mathias Frank';

Question: If the stage is smaller than 5.0, and the points classification is by Marco Marcato, who is the General classification by?
SQL: SELECT "General classification" FROM "1-27573848-18" WHERE "Points classification" = 'Marco Marcato' AND "Stage" < 5.0;

Question: How many different people had a General Classification on Stage 5?
SQL: SELECT COUNT("General classification") FROM "1-27573848-18" WHERE "Stage" = 5.0;

Question: How many times was Robert Gesink a winner?
SQL: SELECT COUNT("Mountains Classification") FROM "1-27573848-18" WHERE "Winner" = 'Robert Gesink';

Question: If the winner is Rui Costa, who made the mountains classification?
SQL: SELECT "Mountains Classification" FROM "1-27573848-18" WHERE "Winner" = 'Rui Costa';