CREATE TABLE table_19857 ("Stage" FLOAT, "Winner" CLOB, "General classification" CLOB, "Points classification" CLOB, "Mountains classification" CLOB, "Combination classification" CLOB, "Team classification" CLOB)

What is the minimum stage where Sergei Smetanine won?
SELECT MIN("Stage") FROM table_19857 WHERE "Winner" = 'Sergei Smetanine'
SELECT MIN("Stage") FROM "table_19857" WHERE "Winner" = 'Sergei Smetanine'