CREATE TABLE table_204_780 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "notes" TEXT)

what is the difference between notes in 1990 and 1989 ?
SELECT ABS((SELECT "notes" FROM table_204_780 WHERE "year" = 1990) - (SELECT "notes" FROM table_204_780 WHERE "year" = 1989))
SELECT ABS((SELECT "notes" FROM "table_204_780" WHERE "year" = 1990) - (SELECT "notes" FROM "table_204_780" WHERE "year" = 1989))