创建的视图替换嵌套SELECT，没有工作

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SQL Server 2012的创建的视图替换嵌套SELECT，没有工作

这里是一个嵌套SELECT声明工程

SELECT DISTINCT Computer_Name, IP_Address, COUNT(Computer_ID) AS Num_Computer_ID 
FROM dbo.Computers 
WHERE Computer_Name in (SELECT DISTINCT Computer_Name 
         FROM dbo.Computers 
         WHERE dbo.Computers.COMPUTER_NAME LIKE '%s001' 
         AND dbo.Computers.IP_Address LIKE '%.100' 
         GROUP BY Computer_Name,IP_Address 
         HAVING COUNT(DISTINCT Computer_ID) > 1) 
AND dbo.Computers.COMPUTER_NAME LIKE '%s001' 
AND dbo.Computers.IP_Address LIKE '%.100' 
GROUP BY Computer_Name, IP_Address 
ORDER BY Num_Computer_ID DESC

我创建的视图，以避免嵌套SELECT声明

CREATE VIEW V_Duplicate_ID 
AS SELECT DISTINCT Computer_Name 
FROM dbo.Computers 
WHERE dbo.Computers.COMPUTER_NAME LIKE '%s001' 
AND dbo.Computers.IP_Address LIKE '%.100' 
GROUP BY Computer_Name,IP_Address 
HAVING COUNT(DISTINCT Computer_ID) > 1;

当我运行SELECT * FROM V_Duplicate_ID它的工作原理，但是当我合并视图来替换嵌套SELECT陈述

SELECT DISTINCT Computer_Name, IP_Address, COUNT(Computer_ID) AS Num_Computer_ID 
FROM dbo.Computers, [V_Duplicate_ID] 
WHERE dbo.Computers.Computer_Name = [dbo].[V_Duplicate_ID].Computer_Name 
AND dbo.Computers.COMPUTER_NAME LIKE '%s001' 
AND dbo.Computers.IP_Address LIKE '%.100' 
GROUP BY Computer_Name, IP_Address 
ORDER BY Num_Computer_ID DESC

我得到的错误

Msg 209, Level 16, State 1, Line 6 
Ambiguous column name 'Computer_Name'. 
Msg 209, Level 16, State 1, Line 1 
Ambiguous column name 'Computer_Name'.

如何解决？

来源

2014-10-30 Glowie

添加表的别名'Computer_Name'列（或'dbo.Computers'或'[V_Duplicate_ID ]'）。请不要使用非ANSI，不推荐使用隐式连接 – Lamak 2014-10-30 18:43:22

此外，您的查询看起来非常复杂，并且很可能会得到改进。 'Computer_ID'是'dbo.Computers'表的主键吗？ – Lamak 2014-10-30 18:47:33

@Lamak隐式联接既不是非ansi也不被弃用。它们是ANSI-89，更常见的用法是ANSI-92。它们也不被弃用。然而，它们很难处理，而且更容易发生意外交叉连接。 – 2014-10-30 19:05:07

使用下面的select查询，简单地把dbo.Computers在SELECT和GROUP BY关键字的Computer_Name的前面。

因为当视图被创建时，它也有一个列名称Computer_name。所以有冲突。但是，当u单独查询之前执行，则列名会一直DISTINCT（计算机名）

SELECT DISTINCT **dbo.Computers.Computer_Name**, 
IP_Address, COUNT(Computer_ID) AS Num_Computer_ID 
FROM dbo.Computers, [V_Duplicate_ID] 
WHERE dbo.Computers.Computer_Name = [dbo].[V_Duplicate_ID].Computer_Name 
AND dbo.Computers.COMPUTER_NAME LIKE '%s001' 
AND dbo.Computers.IP_Address LIKE '%.100' 
GROUP BY **dbo.Computers.Computer_Name**, IP_Address 
ORDER BY Num_Computer_ID DESC

来源

2014-10-30 18:48:46

创建的视图替换嵌套SELECT，没有工作

回答

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