CREATE TABLE table_47834 ("Round" FLOAT, "Pick" FLOAT, "Overall" FLOAT, "Name" TEXT, "Position" TEXT, "College" TEXT)

Which Overall has a Name of markus koch?
SELECT SUM("Overall") FROM table_47834 WHERE "Name" = 'markus koch'
SELECT SUM("Overall") FROM "table_47834" WHERE "Name" = 'markus koch'