CREATE TABLE table_204_312 (id NUMBER, "stage" CLOB, "date" CLOB, "route" CLOB, "terrain" CLOB, "length" CLOB, "winner" CLOB)

how many miles is the metz - nancy route ?
SELECT "length" FROM table_204_312 WHERE "route" = 'metz - nancy'
SELECT "length" FROM "table_204_312" WHERE "route" = 'metz - nancy'