CREATE TABLE table_204_957 (id NUMBER, "year" NUMBER, "team" CLOB, "games" NUMBER, "combined tackles" NUMBER, "tackles" NUMBER, "assisted tackles" NUMBER, "sacks" NUMBER, "forced fumbles" NUMBER, "fumble recoveries" NUMBER, "fumble return yards" NUMBER, "interceptions" NUMBER, "interception return yards" NUMBER, "yards per interception return" NUMBER, "longest interception return" NUMBER, "interceptions returned for touchdown" NUMBER, "passes defended" NUMBER)

how many interception return yards does this player have throughout his career ?
SELECT SUM("interception return yards") FROM table_204_957
SELECT SUM("interception return yards") FROM "table_204_957"