CREATE TABLE table_204_29 (id NUMBER, "rank" NUMBER, "lane" NUMBER, "name" CLOB, "nationality" CLOB, "time" CLOB, "notes" CLOB)

how many total competitors did canada have ?
SELECT COUNT("name") FROM table_204_29 WHERE "nationality" = 'canada'
SELECT COUNT("name") FROM "table_204_29" WHERE "nationality" = 'canada'