CREATE TABLE table_203_630 (id NUMBER, "rank" NUMBER, "nation" CLOB, "gold" NUMBER, "silver" NUMBER, "bronze" NUMBER, "total" NUMBER)

how many more gold medals does china have over france ?
SELECT (SELECT "gold" FROM table_203_630 WHERE "nation" = 'china') - (SELECT "gold" FROM table_203_630 WHERE "nation" = 'france')
SELECT (SELECT "gold" FROM "table_203_630" WHERE "nation" = 'china') - (SELECT "gold" FROM "table_203_630" WHERE "nation" = 'france')