MS SQL DISTINCT가있는 MAX (ID)를 기반으로 여러 열을 선택하십시오.

Question

두 개의 쿼리를 병합하려고합니다. 목표는 MAX (ID)를 기반으로하는 최신 리스팅의 제목과 제목과 함께 고유 한 고객 전자 메일이있는 레코드 세트를 얻는 것입니다.

DISTINCT를 사용하면 전자 메일과 ID를 얻을 수 있지만 분명히 제목을 추가하면이 문제가 해결됩니다.

이

내가 지금까지 무엇을 가지고 :

SELECT DISTINCT MAX(EV_ID) As EV_ID, EV_ContactEmail, EV_CusName 
FROM tblEvents ev 
INNER JOIN tblCustomers cus ON cus.CUS_ID = ev.EV_CustomerID 
WHERE (
    CUS_IsAdmin = 'y' 
    AND CUS_Live = 'y' 
    AND EV_Live = 'y' 
    AND EV_EndDate >= '2012/7/5 12:00:00 AM' 
    AND EV_ContactEmail <> '' 
    ) 
GROUP BY EV_ContactEmail 

은 내가 가입 자체를 할 필요가 나타 말을 여기에 일부 게시물을 발견했지만 내가 레코드의 동일한 금액을 돌려받을 수 없지만, 제목으로 더 많은 것을 반환합니다.

SELECT DISTINCT MAX(EV_ID) As EV_ID, ev.EV_Title, EV_ContactEmail, EV_CusName 
FROM tblEvents ev 
INNER JOIN tblCustomers cus ON cus.CUS_ID = ev.EV_CustomerID 
INNER JOIN (
    SELECT EV_Title, MAX(EV_ID) AS MaxID 
    FROM tblEvents 
    GROUP BY EV_Title 
) groupedev ON ev.EV_Title = groupedev.EV_Title AND ev.EV_ID = groupedev.MaxID 
WHERE (
    CUS_IsAdmin = 'y' 
    AND CUS_Live = 'y' 
    AND EV_Live = 'y' 
    AND EV_EndDate >= '2012/7/5 12:00:00 AM' 
    AND EV_ContactEmail <> '' 
) 
GROUP BY EV_ContactEmail, ev.EV_Title 

누구에게 잘못 되었나요?

Answer 1

SELECT e.EV_ID, e.EV_ContactEmail, e.EV_CusName 
FROM 
     events AS e 
    INNER JOIN 
     (SELECT MAX(EV_ID) As EV_ID 
      FROM tblEvents ev 
      INNER JOIN tblCustomers cus 
       ON cus.CUS_ID = ev.EV_CustomerID 
      WHERE CUS_IsAdmin = 'y' 
      AND CUS_Live = 'y' 
      AND EV_Live = 'y' 
      AND EV_EndDate >= '20120705T00:00:00' --- notice the unambiguous 
      AND EV_ContactEmail <> ''    --- datetime format 
      GROUP BY EV_ContactEmail 
     ) AS tmp 
     ON tmp.EV_ID = e.EV_ID ; 

Answer 2

이와 비슷한?

SELECT DISTINCT EV_ID, EV_ContactEmail, EV_CusName, EV_Title 
FROM tblEvents ev 
    INNER JOIN tblCustomers cus 
     ON cus.CUS_ID = ev.EV_CustomerID 
    INNER JOIN (SELECT MAX(EV_ID) AS MaxID 
       FROM tblEvents 
       GROUP BY EV_ContactEmail) sub 
     ON ev.EV_ID = sub.MaxID 
WHERE CUS_IsAdmin = 'y' 
    AND CUS_Live = 'y' 
    AND EV_Live = 'y' 
    AND EV_EndDate >= '2012/7/5 12:00:00 AM' 
    AND EV_ContactEmail <> '' 

Answer 3

대신 distinct, 당신은 EV_ContactEmail, EV_CusName, EV_ID desc에 의해 처음으로 주문을 할 수있는 다음 그룹 다른 모든 열은

SELECT MAX(EV_ID) As EV_ID, EV_ContactEmail, EV_CusName 
FROM 
(
    SELECT EV_ID As EV_ID, EV_ContactEmail, EV_CusName 
    FROM tblEvents ev 
    INNER JOIN tblCustomers cus ON cus.CUS_ID = ev.EV_CustomerID 
    WHERE (  
     CUS_IsAdmin = 'y'  
     AND CUS_Live = 'y'  
     AND EV_Live = 'y'  
     AND EV_EndDate >= '2012/7/5 12:00:00 AM'  
     AND EV_ContactEmail <> ''  
    ) 
    ORDER BY EV_ContactEmail, EV_CusName, EV_ID DESC -- you can add title also here before ev_id 
) 
GROUP BY EV_ContactEmail, EV_CusName -- if you need title in query, also add title here 

Answer 4

'왼쪽 외부 조인'에 '내부 조인'으로 변경하십시오
하는 DISTINCT SELECT MAX (EV_ID) EV_ID, EV_ContactEmail, EV_CusName
발신 tblEvents ev
왼쪽 외부 조인 tblCustomers cus ON cus.CUS_ID = ev.EV_CustomerID
WHERE (
CUS_IsAdmin = 'Y'
AND
AND EV_Live가 = 'Y'
AND EV_EndDate> = '2012년 7월 5일 오전 12시 0분 0초'
EV_ContactEmail CUS_Live AND = 'Y' EV_ContactEmail
BY <은> ''
) 그룹