使用SQL組同時保持相同的varchar值

Question

我有一個返回兩個值的查詢。我想擁有最大的價值，所以我做了一組，然後MAX。但是，我有三個其他列（varchar），我希望與使用max引入的id保持一致。

例子。

OId  CId FName LName BName 

18477 110 Hubba Bubba whoa 
158  110 Test2 Person2 leee 

我要的是 OID識別符FName參數LName的BNAME

18477 110 Hubba Bubba whoa 

所以我想將它們按識別符。而且，我想保持最大的數字。我無法使用Min或Max作爲FName，LName或BName，因爲我希望它們成爲具有所選OId的那個。我甚至不需要其他行的FName，LName和BName。

我嘗試使用SELECT TOP，但只是從字面上拉一行，我需要多個。

SQL

INSERT INTO #CustomerInfoAll(FName, LName, BName, OwnerId, CustomerId) 
SELECT 
-- what goes here --(o.FirstName) AS FName, 
-- what goes here --(o.LastName) AS LName, 
-- what goes here --(o.BusinessName) AS BName, 
MAX(o.OId) AS OId, 
(r.CId) AS CId 
FROM Owner o 
INNER JOIN Report r 
ON o.ReportId = r.ReportId 
WHERE r.CId IN (SELECT CId FROM #ThisReportAll) 
AND r.Completed IS NOT NULL 
GROUP BY r.CId 
ORDER BY OId DESC; 

Answer 1

假設你有SQL Server 2005或更高：

INSERT INTO #CustomerInfoAll (FName, LName, BName, OwnerId, CustomerId) 
SELECT 
    FirstName, 
    LastName, 
    BusinessName, 
    Id, 
    CId 
FROM 
    (
     SELECT 
     Seq = ROW_NUMBER() OVER (PARTITION BY r.CId ORDER BY o.Id DESC), 
     o.Id, 
     r.CId, 
     o.FirstName, 
     o.LastName, 
     o.BusinessName 
     FROM 
     dbo.Owner o 
     INNER JOIN dbo.Report r 
      ON o.ReportId = r.ReportId 
     WHERE 
     EXISTS (-- can be INNER JOIN instead if `CId` is unique in temp table 
      SELECT * 
      FROM #ThisReportAll tra 
      WHERE r.CId = tra.CId 
     ) 
     AND r.Completed IS NOT NULL 
     GROUP BY 
     o.Id, 
     r.CId, 
     o.FirstName, 
     o.LastName, 
     o.BusinessName 
    ) x 
WHERE 
    x.Seq = 1; 

• 確實使用在所有的對象（dbo.Owner和​​）全模式名稱。
• 儘可能使用半連接（EXISTS子句）或INNER JOIN而不是IN。