SQL select 문에서 Order By 1의 목적은 무엇입니까? 회사에서 오래된 코드를 읽고 있는데, 몇 가지 보기가 있습니다.order by 1절이것은 무엇을 달성합니까? 예: 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 ORDE..