将MySQL代码转换为Access：GROUP_CONCAT和三重JOIN

我很难将一段MySQL代码翻译成Access.
我正在尝试使用Sakila(MySQL)数据库中的一个查询来处理我正在进行的Access项目.

首先,GROUP_CONCAT函数根本不起作用.在一些谷歌搜索后,我发现Access不支持此功能,但我找不到可行的替代方案.然而,CONCAT可以被一些”操作符所取代.

然后是三重LEFT JOIN,它不断返回缺少的操作错误.我找到了一篇博客文章,解释了一系列括号如何帮助,但这导致了更多的麻烦,并促使我删除括号,之后它丢失了更多的操作符错误.

此外,SEPARATOR似乎也不被接受,但这可能是由于GROUP_CONCAT无法正常运行.

有没有人愿意让我朝着正确的方向前进？我一直在努力解决这个问题太久了.

SELECT
a.actor_id,
a.first_name,
a.last_name,
GROUP_CONCAT(DISTINCT CONCAT(c.name, ': ',
    (SELECT GROUP_CONCAT(f.title ORDER BY f.title SEPARATOR ', ')
                FROM film f
                INNER JOIN film_category fc
                  ON f.film_id = fc.film_id
                INNER JOIN film_actor fa
                  ON f.film_id = fa.film_id
                WHERE fc.category_id = c.category_id
                AND fa.actor_id = a.actor_id
             )
         )
         ORDER BY c.name SEPARATOR '; ')
AS film_info
FROM
actor AS a
LEFT JOIN film_actor AS fa ON a.actor_id = fa.actor_id
LEFT JOIN film_category AS fc ON fa.film_id = fc.film_id
LEFT JOIN category AS c ON fc.category_id = c.category_id
GROUP BY a.actor_id, a.first_name, a.last_name

解决方法:

MySQL GROUP_CONCAT()函数最常用的Access替代方案是Allen Browne的ConcatRelated()函数,可用于here.

至于JOIN周围的括号,是的,Access SQL很挑剔.代替

FROM
actor AS a
LEFT JOIN film_actor AS fa ON a.actor_id = fa.actor_id
LEFT JOIN film_category AS fc ON fa.film_id = fc.film_id
LEFT JOIN category AS c ON fc.category_id = c.category_id

尝试

FROM 
    (
        (
            actor AS a 
            LEFT JOIN 
            film_actor AS fa 
                ON a.actor_id = fa.actor_id
        ) 
        LEFT JOIN 
        film_category AS fc 
            ON fa.film_id = fc.film_id
    ) 
    LEFT JOIN 
    category AS c 
        ON fc.category_id = c.category_id

标签：mysql,ms-access,group-concat
来源： https://codeday.me/bug/20190929/1831165.html