CREATE TABLE table_204_4 (id DECIMAL, "date" TEXT, "race" TEXT, "competition" TEXT, "rider" TEXT, "country" TEXT, "location" TEXT)

how many times was tom boonen listed as the rider ?
SELECT COUNT(*) FROM table_204_4 WHERE "rider" = 'tom boonen'
SELECT COUNT(*) FROM "table_204_4" WHERE "rider" = 'tom boonen'