CREATE TABLE table_204_771 (id NUMBER, "rank" NUMBER, "nation" CLOB, "gold" NUMBER, "silver" NUMBER, "bronze" NUMBER, "total" NUMBER)

calculate the difference in the number of gold medals won between venezuela and colombia .
SELECT (SELECT "gold" FROM table_204_771 WHERE "nation" = 'venezuela') - (SELECT "gold" FROM table_204_771 WHERE "nation" = 'colombia')
SELECT (SELECT "gold" FROM "table_204_771" WHERE "nation" = 'venezuela') - (SELECT "gold" FROM "table_204_771" WHERE "nation" = 'colombia')