Oracle 到 MS-Access SQL：

Question

我正在尝试将 SQL 代码从 Oracle 复制到我的 Access 以自动创建一些报告。到目前为止，我已经成功了，但我遇到了麻烦：

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) 上运行并且可以工作。 MS-Access 似乎在子查询中返回不止一行。我用尽了我的知识，但我似乎无法复制它。

我做错了什么？

另外，Oracle SQL 代码中的这个 (+) 运算符是什么？

我知道这个运算符是 OUTER (LEFT/RIGHT) JOIN，但我从来没有见过它被这样使用，这绝对不是 JOIN。

有人可以帮我吗？

Answer 1

可能在将 Oracle 的隐式连接转换为 MS Access 显式连接时，您在派生表的子查询中为 PROJECT_MANAGER 列添加了一个额外的 INNER JOIN 引用 apps_pa_projects_all 表，替换别名 p。但是，此子查询与外部 FROM 子句的派生表相关，apps_pa_projects_all 具有原始别名 p：

考虑删除第二个INNER JOIN 并返回相关的WHERE 子句条件：

原创

...
    (
        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'
         ...

改变

...
    (
        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'
         ...