根据其他表的结果从表中选择

Question

首先，这是我没有创建且无法更改的数据库设置（Access 2010）：

违反：

包装：

我想在给定的Role1和Role2匹配记录时选择WorkPackageCodes。例如，如果Role1为3而Role 2为8，我希望WorkPackageCodes的ID为3和8.例如，Role1为4，Role2为6，则不应选择任何一个。

我通过多个查询实现了这一点，但我想在一个查询中使用它（使用/不使用子查询）。所以我需要一些东西，我可以让我们看看WorkPackageID是否在另一个表的结果集中。我试过这个：

//3 and 6 will be replaced by parameters
SELECT Role1 AS role FROM tblSODViolations
UNION
SELECT Role2 FROM tblSODViolations
WHERE Role1 = 3 AND Role2 = 6

这给了我想要的结果，我试着做一个查询，如下：

SELECT WorkPackageCode
FROM tblWorkPackages
WHERE WorkPackageID IN (SELECT Role1 AS r FROM tblSODViolations
                        UNION ALL
                        SELECT Role2 FROM tblSODViolations
                        WHERE Role1 = 3 AND Role2 = 6);

但是，如果我运行这个，我收到消息：

  

子查询中不允许执行此操作。

那我怎么能做到这一点？或者有没有办法在某种SQL if语句中选择WorkPackageCode？提前谢谢！

Answer 1

尝试将其作为联接：

SELECT WorkPackageCode
FROM tblWorkPackages wp join
     tblSODViolations v
     on wp.WorkPackageID in (v.Role1, wp.WorkPackageId = v.Role2) and
        v.Role1 = 3 and v.Role2 = 6;

这可能会产生重复。如果是的话，

SELECT distinct WorkPackageCode
FROM tblWorkPackages wp join
     tblSODViolations v
     on wp.WorkPackageID in (v.Role1, wp.WorkPackageId = v.Role2) and
        v.Role1 = 3 and v.Role2 = 6;

但是，我不清楚为什么这不起作用：

SELECT WorkPackageCode
FROM tblWorkPackages wp
WHERE wp.WorkPackageID in (3, 6);

您也可以这样写：

SELECT WorkPackageCode
FROM tblWorkPackages wp
WHERE wp.WorkPackageID in (3, 6) and
      exists (select 1 from tblSODViolations where Role1 = 3 and Role2 = 6)

此特定版本最接近您描述所需内容的方式。

Answer 2

将联合创建为内联表，并使用它来限制结果。

SELECT WorkPackageCode
FROM tblWorkPackages WP
INNER JOIN 
(SELECT Role1 AS r FROM tblSODViolations
                        UNION ALL
                        SELECT Role2 FROM tblSODViolations
                        WHERE Role1 = 3 AND Role2 = 6) B 
on B.R = WP.WorkPackageID;

...替代地

Select workpackageCode 
FROM tblWorkPackages WP
INNER JOIN tblSODViolations V on V.WorkPackageID=WP.Role1
OR V.workPackageID=WP.Role2
WHERE V.Role1=3 and V.Role2=6