Question

我需要从子查询中的外部查询访问别名，就像这段代码一样。除非它不起作用。有没有办法做到这一点？我的目标是为每个OwnerIdName创建这些聚合函数，这是我能想到的唯一方法。我在SQL Server 2008中工作。

由于

SELECT Incident.OwnerIdName as OIN
  ,(SELECT COUNT(*)
    FROM Incident 
    WHERE CreatedOn BETWEEN '2011/1/1' AND '2011/1/31'
    AND Incident.OwnerIdName = OIN ) as CasesOpened
  ,(SELECT COUNT(*)
    FROM IncidentResolution 
    WHERE ActualEnd BETWEEN '2011/1/1' AND '2011/1/31'
            AND Incident.OwnerIdName = OIN ) as CasesClosed
FROM Incident

Answer 1

你不能直接使用列名..？像..

SELECT Inc.OwnerIdName as OIN
  ,(SELECT COUNT(*)
    FROM Incident 
    WHERE CreatedOn BETWEEN '2011/1/1' AND '2011/1/31'
    AND Incident.OwnerIdName = Inc.OwnerIdName ) as CasesOpened
  ,(SELECT COUNT(*)
    FROM IncidentResolution 
    WHERE ActualEnd BETWEEN '2011/1/1' AND '2011/1/31'
            AND Incident.OwnerIdName = Inc.OwnerIdName ) as CasesClosed
FROM Incident Inc

如果要直接使用Alias，则必须在查询的早期执行此操作，然后将其用于所有标量子查询。

SELECT INC.OIN
  ,(SELECT COUNT(*)
    FROM Incident 
    WHERE CreatedOn BETWEEN '2011/1/1' AND '2011/1/31'
    AND Incident.OwnerIdName = INC.OIN ) as CasesOpened
  ,(SELECT COUNT(*)
    FROM IncidentResolution 
    WHERE ActualEnd BETWEEN '2011/1/1' AND '2011/1/31'
            AND Incident.OwnerIdName = INC.OIN ) as CasesClosed
from 
(Select OwnerIdName OIN
  FROM Incident) INc

Answer 2

试试这个（适用于＆gt; = SQL 2005）：

WITH 
    CreatedQry AS
    (
        SELECT OwnerIdName, COUNT(1) AS CreatedCount
          FROM  Incident 
        WHERE CreatedOn BETWEEN '2011/1/1' AND '2011/1/31'
    ),
    EndQry AS
    (
        SELECT OwnerIdName, COUNT(1) AS EndCount
          FROM  IncidentResolution  
        WHERE ActualEnd  BETWEEN '2011/1/1' AND '2011/1/31'
    )
    SELECT  CreatedQry.OwnerIdName, CreatedCount, EndCount
      FROM  CreatedQry LEFT JOIN EndQry
        ON  CreatedQry.OwnerIdName = EndQry.OwnerIdName

在子查询中访问别名

2 个答案: