Oracle到MS-Access SQL：

Question

我试图将SQL代码从Oracle复制到Access，以自动创建一些报告。 到目前为止，我已经成功了，但是我遇到了一个麻烦：

这是Oracle SQL：

SELECT DISTINCT o587265.PROJECT_NUMBER AS E587273,
    o587265.PROJECT_NAME AS E587274,
    o587265.PROJECT_STATUS_CODE AS E587275,
    o587265.PROJECT_MANAGER AS E587276
FROM (
    SELECT p.segment1 project_number,
        p.NAME project_name,
        p.project_status_code,
        (
            SELECT a.FULL_NAME
            FROM apps.per_all_people_f a,
                apps.pa_project_players_v pm
            WHERE a.person_id = pm.person_id
                AND pm.project_ID = p.project_ID
                AND pm.ROLE = 'Project Manager'
                AND a.current_employee_flag = 'Y'
                AND a.person_type_id = 1
                AND SYSDATE BETWEEN a.effective_start_date
                    AND a.effective_end_date
                AND SYSDATE BETWEEN pm.start_date_active(+)
                    AND NVL(pm.end_date_active, SYSDATE)
            ) project_manager
    FROM apps.pa_projects_all p
    WHERE p.project_status_code != 'CLOSED'
        AND p.template_flag = 'N'
        AND p.org_ID = 5003
    ) o587265
    ORDER BY o587265.PROJECT_NUMBER ASC,
    o587265.PROJECT_NAME ASC,
    o587265.PROJECT_MANAGER ASC;

这是我当前的MS-Access版本：

SELECT DISTINCT o587265.PROJECT_NUMBER AS E587273,
    o587265.PROJECT_NAME AS E587274,
    o587265.PROJECT_STATUS_CODE AS E587275,
    o587265.PROJECT_MANAGER AS E587276
FROM (
    SELECT p.segment1 AS project_number,
        p.NAME AS project_name,
        p.project_status_code,
        (
            SELECT a.FULL_NAME
            FROM ((apps_per_all_people_f AS a INNER JOIN apps_pa_project_players_v AS pm ON a.person_id = pm.person_id
                ) INNER JOIN apps_pa_projects_all AS p ON pm.project_ID = p.project_ID
            )
            WHERE pm.ROLE = 'Project Manager'
                AND a.current_employee_flag = 'Y'
                AND a.person_type_id = 1
                AND DATE () BETWEEN a.effective_start_date
                AND a.effective_end_date
                AND DATE () BETWEEN pm.start_date_active
                AND IIf(IsNull(pm.end_date_active), DATE (), pm.end_date_active)
            ) AS PROJECT_MANAGER
    FROM apps_pa_projects_all AS p
    WHERE p.project_status_code <> 'CLOSED'
        AND p.template_flag = 'N'
        AND p.org_ID = 5003
    ) AS o587265
ORDER BY o587265.PROJECT_NUMBER ASC,
    o587265.PROJECT_NAME ASC,
    o587265.PROJECT_MANAGER ASC;

第一个直接在Oracle 11g（SQL Developer）上运行并可以运行。 MS-Access似乎在子查询中返回多个行。 我用尽了我的知识，但似乎无法复制它。

我究竟做错了什么？

另外，Oracle SQL代码中的这个（+）运算符是什么？

我将这个运算符称为OUTER（左/右）联接，但是我从未见过像那样使用它，而且绝对不是联接。

有人能帮我吗？

Answer 1

可能是在Oracle的MS Access显式INNER JOIN的隐式INNER JOIN的转换中，您在派生表的子查询的PROJECT_MANAGER列中引用了apps_pa_projects_all表，从而添加了一个附加的INNER JOIN ，从而代替了别名p 。 但是，此子查询与具有原始别名p的外部FROM子句的派生表apps_pa_projects_all相关：

考虑删除第二个INNER JOIN并返回相关的WHERE子句条件：

原版的

...
    (
        SELECT a.FULL_NAME
        FROM ((apps_per_all_people_f AS a 
        INNER JOIN apps_pa_project_players_v AS pm 
                ON a.person_id = pm.person_id) 
        INNER JOIN apps_pa_projects_all AS p 
                ON pm.project_ID = p.project_ID)
        WHERE pm.ROLE = 'Project Manager'
         AND a.current_employee_flag = 'Y'
         ...

更改

...
    (
        SELECT a.FULL_NAME
        FROM apps_per_all_people_f AS a 
        INNER JOIN apps_pa_project_players_v AS pm 
                ON a.person_id = pm.person_id
        WHERE pm.project_ID = p.project_ID
         AND pm.ROLE = 'Project Manager'
         AND a.current_employee_flag = 'Y'
         ...