select返回零行，尽管它应该返回一些条目

Question

我有一个代表一个简单演示论坛的postgres数据库。有两个表

主题

id   | topic_id (the parent topic) | name | description
-------------------------------------------------------
uuid | uuid                        | text | text

和线程

id   | topic_id | name | created_at
-------------------------------------------------------
uuid | uuid     | text | timestamp without timezone

通过使用Express REST API，我想获取一个主题的所有信息。我传递了它的ID，并希望得到这样的结果

{
    parentTopic: {}, // could be null if no parent is available
    name: "",
    description: "",
    childTopics: [{}, {}, {}],
    threads: [{}, {}, {}] // should be sorted by created_at
}

据我所知，不可能返回这样的结果。但是我试图创建一个查询来获取这些信息，也许以后我可以用一些代码来映射它。

SELECT
    currentTopic.name,
    currentTopic.description,
    parentTopic.id AS parentTopicId,
    parentTopic.name AS parentTopicName,
    parentTopic.description AS parentTopicDescription,
    childTopic.id AS childTopicId,
    childTopic.name AS childTopicName,
    childTopic.description AS childTopicDescription,
    linkedThread.id AS threadId,
    linkedThread.name AS threadName,
    linkedThread.created_at AS threadCreatedAt
FROM
    topic currentTopic
INNER JOIN
    topic parentTopic ON currentTopic.topic_id = parentTopic.id
INNER JOIN
    topic childTopic ON currentTopic.id = childTopic.topic_id
INNER JOIN
    thread linkedThread ON currentTopic.id = linkedThread.topic_id
WHERE
    currentTopic.id = '624aaab6-2d2d-45dc-a425-c2863f05779c'
ORDER BY
    linkedThread.created_at;

执行此操作（我使用pgAdmin）时，没有错误发生，但返回0行。我确保应该检索一些条目。

该查询有问题吗？有没有一种方法可以改进查询以返回可以立即使用的结果（上面提到的JS对象）？

编辑：

以下是有关主题和主题的一些测试数据

主题表：

线程表：

Answer 1

将内部联接更改为左联接

SELECT
    currentTopic.name,
    currentTopic.description,
    parentTopic.id AS parentTopicId,
    parentTopic.name AS parentTopicName,
    parentTopic.description AS parentTopicDescription,
    childTopic.id AS childTopicId,
    childTopic.name AS childTopicName,
    childTopic.description AS childTopicDescription,
    linkedThread.id AS threadId,
    linkedThread.name AS threadName,
    linkedThread.created_at AS threadCreatedAt
FROM
    topic currentTopic
left JOIN
    topic parentTopic ON currentTopic.topic_id = parentTopic.id
left JOIN
    topic childTopic ON currentTopic.id = childTopic.topic_id
left JOIN
    thread linkedThread ON currentTopic.id = linkedThread.topic_id
WHERE
    currentTopic.id = '624aaab6-2d2d-45dc-a425-c2863f05779c'
ORDER BY
    linkedThread.created_at;