CREATE TABLE table_203_539 (id NUMBER, "year" NUMBER, "competition" CLOB, "venue" CLOB, "position" CLOB, "event" CLOB, "notes" NUMBER)

how many 110 m hurdles did china compete in ?
SELECT COUNT(*) FROM table_203_539 WHERE "event" = '110 m hurdles'
SELECT COUNT(*) FROM "table_203_539" WHERE "event" = '110 m hurdles'