CREATE TABLE table_203_405 (id NUMBER, "week" NUMBER, "date" CLOB, "opponent" CLOB, "result" CLOB, "attendance" NUMBER)

how many times were the dallas cowboys listed as an opponent ?
SELECT COUNT(*) FROM table_203_405 WHERE "opponent" = 'dallas cowboys'
SELECT COUNT(*) FROM "table_203_405" WHERE "opponent" = 'dallas cowboys'