CREATE TABLE table_204_155 (id NUMBER, "rank" NUMBER, "heat" NUMBER, "athlete" CLOB, "nationality" CLOB, "time" NUMBER, "notes" CLOB)

what is the difference between mexico and brazil time
SELECT ABS((SELECT "time" FROM table_204_155 WHERE "nationality" = 'mexico') - (SELECT "time" FROM table_204_155 WHERE "nationality" = 'brazil'))
SELECT ABS((SELECT "time" FROM "table_204_155" WHERE "nationality" = 'mexico') - (SELECT "time" FROM "table_204_155" WHERE "nationality" = 'brazil'))