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

the 1990 european championships and the 1988 olympic games both resulted in what position for this competitor ?
SELECT "position" FROM table_204_780 WHERE "year" = 1990 AND "competition" = 'european championships'
SELECT "position" FROM "table_204_780" WHERE "competition" = 'european championships' AND "year" = 1990