CREATE TABLE table_203_221 (id NUMBER, "name" CLOB, "nationality" CLOB, "matches played" NUMBER, "goals scored" NUMBER, "notes" CLOB)

how many more goals did archie thompson score than billy celeski ?
SELECT (SELECT "goals scored" FROM table_203_221 WHERE "name" = 'archie thompson') - (SELECT "goals scored" FROM table_203_221 WHERE "name" = 'billy celeski')
SELECT (SELECT "goals scored" FROM "table_203_221" WHERE "name" = 'archie thompson') - (SELECT "goals scored" FROM "table_203_221" WHERE "name" = 'billy celeski')