CREATE TABLE table_204_135 (id NUMBER, "position" NUMBER, "club" CLOB, "played" NUMBER, "points" NUMBER, "wins" NUMBER, "draws" NUMBER, "losses" NUMBER, "goals for" NUMBER, "goals against" NUMBER, "goal difference" NUMBER)

what are the point differences between the first and last team ?
SELECT (SELECT "points" FROM table_204_135 ORDER BY "position" LIMIT 1) - (SELECT "points" FROM table_204_135 ORDER BY "position" DESC LIMIT 1)
SELECT (SELECT "points" FROM "table_204_135" ORDER BY "position" FETCH FIRST 1 ROWS ONLY) - (SELECT "points" FROM "table_204_135" ORDER BY "position" DESC FETCH FIRST 1 ROWS ONLY)