職場で古いコードを読んでいて、order by 1句のあるビューがいくつかあることに気づきました。これは何を達成しますか? 例: Create view v_payment_summary AS SELECT A.PAYMENT_DATE, (SELECT SUM(paymentamount) FROM payment B WHERE PAYMENT_DATE = B.PAYMENT_DATE and SOME CONDITION) AS SUM_X, (SELECT SUM(paymentamount) FROM payment B WHERE PAYMENT_DATE = B.PAYMENT_DATE and SOME OTHER CONDITION) AS SUM_Y FROM payment A ORDER BY 1;