Question: What's the general classification of Ignatas Konovalovas when the mountains classification was Stefano Garzelli and points classification was Danilo Di Luca?
SQL: SELECT "General classification" FROM "2-18733814-2" WHERE "Mountains classification" = 'Stefano Garzelli' AND "Points classification" = 'Danilo Di Luca' AND "Winner" = 'Ignatas Konovalovas';

Question: What's the mountains classification when the points classification is Alessandro Petacchi and the general classification is Danilo Di Luca?
SQL: SELECT "Mountains classification" FROM "2-18733814-2" WHERE "Points classification" = 'Alessandro Petacchi' AND "General classification" = 'Danilo Di Luca';

Question: Who was the winner of Stage 9 when then general classification was Danilo Di Luca?
SQL: SELECT "Winner" FROM "2-18733814-2" WHERE "General classification" = 'Danilo Di Luca' AND "Stage" = '9';

Question: What is the stage of winner Carlos Sastre when the general classification was Denis Menchov?
SQL: SELECT "Stage" FROM "2-18733814-2" WHERE "General classification" = 'Denis Menchov' AND "Winner" = 'Carlos Sastre';

Question: What's the points classification of Stage 18 when the general classification was Denis Menchov?
SQL: SELECT "Points classification" FROM "2-18733814-2" WHERE "General classification" = 'Denis Menchov' AND "Stage" = '18';

Question: What's the mountains classification of winner Carlos Sastre when the general classification is Denis Menchov?
SQL: SELECT "Mountains classification" FROM "2-18733814-2" WHERE "General classification" = 'Denis Menchov' AND "Winner" = 'Carlos Sastre';