Sql server 已创建视图以替换嵌套选择，但不起作用

SQL Server 2012

下面是一个嵌套的

SELECT

语句

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

我创建了一个视图来避免嵌套的

SELECT

语句

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;

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

当我运行

SELECT*FROM V_Duplicate_ID

时，它会工作，但当我合并视图以替换嵌套的

SELECT

语句时

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;

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

我会犯错误

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'.

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如何修复？

使用以下选择查询，简单地将dbo.Computers放在计算机名称的前面，按关键字进行选择和分组

因为在创建视图时，它也有一个列名Computer\u name。因此存在冲突。但是当你在查询之前执行时，列名应该是不同的（Computer\u name）

---

为

Computer\u Name

列添加表的别名（dbo.Computers或

[V\u Duplicate\u ID]

）。请不要使用非ansi的、不推荐使用的隐式连接。因此，您的查询看起来非常复杂，很可能会得到改进。

Computer\u ID

是

dbo.Computers

表的主键吗？@Lamak隐式联接既不是非ansi的，也不是不推荐的。它们是ANSI-89，更常见的用法是ANSI-92。它们也没有遭到反对。但是，它们处理起来很糟糕，而且更容易发生意外交叉联接。@SeanLange您可以查看“内部联接的不推荐语法”的示例@Lamak我在SQL Server文档中从未见过这种情况。那里的文档也不正确，它们将该类型的联接引用为内部联接。它是一个交叉连接，其行为类似于where子句的内部连接。我决不是建议使用它，因为它很可怕