CREATE TABLE table_204_885 (id NUMBER, "season" CLOB, "competition" CLOB, "round" CLOB, "opponent" CLOB, "home" CLOB, "away" CLOB, "agg." CLOB, "bye" CLOB)

how many european cups has this team been a part of ?
SELECT COUNT(DISTINCT ("season")) FROM table_204_885 WHERE "competition" = 'european cup'
SELECT COUNT(DISTINCT "season") FROM "table_204_885" WHERE "competition" = 'european cup'