SQL——对在多行键上连接的表使用 IN

Question

好的。我已经设置了一小部分示例表。我只是举个例子，因为这是我交流问题的最佳方式。

证书表:

WorkerId    Name                             Version
----------- -------------------------------- -----------
1           Construction                     1
1           Construction                     2
1           Demolition                       1
1           Fusion                           1
5           Fusion                           1
4           Demolition                       1
4           Demolition                       2

CertDesc 表(版本、名称形式的主键):

Name                             Version     Description
-------------------------------- ----------- -----------------------------------------------------------------------------------------
Construction                     1           Basic Construction -- Required for all construction workers.
Construction                     2           Full Construction -- Required for all construction managers.
Demolition                       1           Demolition -- Explosives --  Required for demolition managers.
Fusion                           1           Fusion System Control -- Includes catastrophic super-criticality recovery.
Demolition                       2           Large Scale Demolition -- Basic fission knowledge with full chemical cert.

现在。我想获取所有 CertDesc 行的列表，这样 WorkerId 1 就没有该证书。对于 X = 1，我应该只获得 Demolition 2。

这是对我来说最好的近乎存在的查询:

Select Distinct d.Name, d.Version, d.Description
From CertDesc d join Certs c on d.Name = c.Name and d.Version = c.Version
Where d.Name NOT IN (Select c2.Name
    From Certs c2
    Where c2.WorkerId = 1)

此查询返回零行。问题是无论版本号如何，拆除行都会被排除在外。我想要的是将 IN 与元组一起使用:

Select Distinct d.Name, d.Version, d.Description
From CertDesc d join Certs c on d.Name = c.Name and d.Version = c.Version
Where (d.Name, d.Version) NOT IN (Select c2.Name, c2.Version)
    From Certs c2
    Where c2.WorkerId = 1)

不幸的是，这在 SQL Server 中是无效的。有人知道解决这个问题的好方法吗？

Answer 1

SELECT  *
FROM    CertDesc cd
WHERE   NOT EXISTS
        (
        SELECT  NULL
        FROM    Certs c
        WHERE   c.WorkerId = 1
                AND c.name = cd.name
                AND c.version = cd.version
        )

，或者，如果 name 和 version 就足够了，就这样:

SELECT  name, version
FROM    CertDesc
EXCEPT
SELECT  name, version
FROM    Certs
WHERE   WorkerId = 1

编辑:后一个查询仅适用于 SQL-Server 2005。