CREATE TABLE table_203_496 (id NUMBER, "pos" NUMBER, "country" CLOB, "gold" NUMBER, "silver" NUMBER, "bronze" NUMBER, "total" NUMBER)

how many more silvers did italy win compared to the united states ?
SELECT (SELECT "silver" FROM table_203_496 WHERE "country" = 'italy') - (SELECT "silver" FROM table_203_496 WHERE "country" = 'united states')
SELECT (SELECT "silver" FROM "table_203_496" WHERE "country" = 'italy') - (SELECT "silver" FROM "table_203_496" WHERE "country" = 'united states')