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

what was the total length listed for stage 3 ?
SELECT "length" FROM table_204_312 WHERE "stage" = '3'
SELECT "length" FROM "table_204_312" WHERE "stage" = '3'