CREATE TABLE table_204_503 (id NUMBER, "year" NUMBER, "competition" CLOB, "venue" CLOB, "position" CLOB, "notes" CLOB)

how many times did she participate in the heptathalon ?
SELECT COUNT(*) FROM table_204_503 WHERE "notes" = 'heptathlon'
SELECT COUNT(*) FROM "table_204_503" WHERE "notes" = 'heptathlon'