안녕하세요.
아래와같이 쿼리문을 하나 작성했는데요.
SELECT LEFT(itemsDate, 6) itemsDate
, AVG(itemsIndex) itemsIndex
, DATE_FORMAT(DATE_ADD(itemsDate, INTERVAL -1 MONTH),'%Y%m') prevDate
FROM wiz_allItemsIndex
WHERE itemsDate BETWEEN '20170501' AND '20190502'
GROUP BY LEFT(itemsDate, 6)
ORDER BY itemsDate DESC
결과는 첨부와 같습니다.
추출하고싶은내용은 prevDate 값의 itemsIndex값을 추출하고싶은데 제가 원하는대로 결과값이 출력되지않아 도움을 얻고자 합니다.
조언좀 부탁드립니다.
WITH C (itemsDate, itemsIndex) AS ( SELECT LEFT(itemsDate, 6) , AVG(itemsIndex) FROM wiz_allItemsIndex WHERE itemsDate BETWEEN '20170501' AND '20190502' GROUP BY LEFT(itemsDate, 6) ) SELECT A.itemsDate , A.itemsIndex , LEFT(DATE_ADD(CONCAT(A.itemsDate, '01'), INTERVAL -1 MONTH), 6) AS prevDate , B.itemsIndex AS prevIndex FROM C A LEFT OUTER C B ON B.itemsDate = LEFT(DATE_ADD(CONCAT(A.itemsDate, '01'), INTERVAL -1 MONTH), 6);
-- MySQL 8.0 이상 분석함수 사용 가능 -- SELECT LEFT(itemsDate, 6) itemsDate , AVG(itemsIndex) itemsIndex , LEAD(AVG(itemsIndex)) OVER(ORDER BY LEFT(itemsDate, 6) DESC) itemsIndex_prevDate FROM wiz_allItemsIndex WHERE itemsDate >= '20170501' AND itemsDate < '20190501' GROUP BY LEFT(itemsDate, 6) ; -- MySQL 8.0 미만 셀프 조인 이용 -- SELECT a.itemsDate , a.itemsIndex , b.itemsIndex AS itemsIndex_prevDate FROM (SELECT LEFT(itemsDate, 6) itemsDate , AVG(itemsIndex) itemsIndex FROM wiz_allItemsIndex WHERE itemsDate >= '20170501' AND itemsDate < '20190501' GROUP BY LEFT(itemsDate, 6) ) a LEFT OUTER JOIN (SELECT LEFT(itemsDate, 6) itemsDate , AVG(itemsIndex) itemsIndex FROM wiz_allItemsIndex WHERE itemsDate >= '20170501' AND itemsDate < '20190501' GROUP BY LEFT(itemsDate, 6) ) b ON DATE_FORMAT(DATE_ADD(CONCAT(a.itemsDate, '01'), INTERVAL -1 MONTH),'%Y%m') = b.itemsDate ;