CREATE TABLE table_204_503 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "notes" TEXT)

which was held in spain , the european championships or european indoor championships ?
SELECT "competition" FROM table_204_503 WHERE "venue" = 'spain' AND "competition" IN ('european championships', 'european indoor championships')
SELECT "competition" FROM "table_204_503" WHERE "competition" IN ('european championships', 'european indoor championships') AND "venue" = 'spain'