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)

how many points did the top team finish ahead of the bottom 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)