CREATE TABLE table_204_880 (id NUMBER, "year" NUMBER, "competition" CLOB, "venue" CLOB, "position" CLOB, "event" CLOB, "notes" CLOB)

how many marathons were held in beijing ?
SELECT COUNT("competition") FROM table_204_880 WHERE "venue" = 'beijing'
SELECT COUNT("competition") FROM "table_204_880" WHERE "venue" = 'beijing'