CREATE TABLE table_204_130 (id NUMBER, "#" NUMBER, "date" CLOB, "venue" CLOB, "opponent" CLOB, "score" CLOB, "result" CLOB, "competition" CLOB)

what is the total number of opponents ?
SELECT COUNT(DISTINCT "opponent") FROM table_204_130
SELECT COUNT(DISTINCT "opponent") FROM "table_204_130"