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第一段背景信息：这是关于 cms，它保存对象-对象关系及其在单个表中的排序，列是 object_id、parent_id 和排序顺序

第二件有几个连接的查询，我想按 2 个参数排序。其中之一是对象本身的排序，第二个是其父对象的排序顺序。

我现在的查询是：

SELECT obj_asset.*, object.headline AS title, oo.sort_order AS sort, op.sort_order FROM obj_asset 
JOIN object ON obj_asset.object_id = object.object_id 
JOIN object_object AS oo on obj_asset.object_id = oo.object_id
JOIN (SELECT sort_order from object_object WHERE object_id = (SELECT parent_id from object_object WHERE object_id = obj_asset.object_id )) AS op ON obj_asset.object_id = oo.object_id
WHERE obj_asset.profile_id = 140 AND obj_asset.rsvp_enabled = 1 AND object.is_published = 1 ORDER BY sort DESC;

它不起作用。不过，这很好用：

SELECT obj_asset.*, object.headline AS title, oo.sort_order AS sort, op.sort_order FROM obj_asset 
JOIN object ON obj_asset.object_id = object.object_id 
JOIN object_object AS oo on obj_asset.object_id = oo.object_id
JOIN (SELECT sort_order from object_object WHERE object_id = (SELECT parent_id from object_object WHERE object_id = 11111 )) AS op ON obj_asset.object_id = oo.object_id
WHERE obj_asset.profile_id = 140 AND obj_asset.rsvp_enabled = 1 AND object.is_published = 1 ORDER BY sort DESC;

我得到的错误是：

1054 - 'where 子句'中的未知列'obj_asset.object_id'

我怎样才能让它工作？

谢谢！

编辑：如果我能想出替代方法将父母排序到查询中，我可以解决这个问题。有没有这样的方法？

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3 回答 3

1

正如您已经发现的那样，问题在于您试图在子查询的约束中使用来自外部查询的列：

  (SELECT sort_order
      from object_object
      WHERE object_id = (SELECT parent_id
                         from object_object
                         WHERE object_id = obj_asset.object_id )
     )

此子查询可以重写，但仅查看原始查询时不清楚如何。

您的原始查询中可能存在错误（重新格式化）：

SELECT obj_asset.*, object.headline AS title, oo.sort_order AS sort, op.sort_order
FROM obj_asset 
JOIN object ON obj_asset.object_id = object.object_id 
JOIN object_object AS oo on obj_asset.object_id = oo.object_id
JOIN (SELECT sort_order
      from object_object
      WHERE object_id = (SELECT parent_id
                         from object_object
                         WHERE object_id = obj_asset.object_id )
     ) AS op ON obj_asset.object_id = oo.object_id
WHERE obj_asset.profile_id = 140 AND obj_asset.rsvp_enabled = 1 AND object.is_published = 1 ORDER BY sort DESC;

命名的子查询op不用于任何连接或 where 子句。

我最好的猜测是您想要执行以下操作：

SELECT obj_asset.*, object.headline AS title, oo.sort_order AS sort, op.sort_order
FROM obj_asset 
JOIN object ON obj_asset.object_id = object.object_id 
JOIN object_object AS oo on obj_asset.object_id = oo.object_id
JOIN (SELECT sort_order, o2.object_id
    from object_object as o1
    INNER JOIN object_object as o2 ON o1.object_id = o2.parent_id
    ) AS op ON obj_asset.object_id = op.object_id
WHERE obj_asset.profile_id = 140 AND obj_asset.rsvp_enabled = 1 AND object.is_published = 1 ORDER BY sort DESC;
于 2011-02-07T21:47:23.350 回答
0

您的子查询在 FROM 子句中不包含 obj_asset。

(SELECT parent_id FROM object_object WHERE object_id = obj_asset.object_id )

让那部分运行起来，你应该对整个事情有更好的运气。

只是一个提示...如果您在 SQL 语句中添加更多换行符和缩进，您将更容易发现问题。

于 2011-02-07T21:16:21.660 回答
0

我认为你需要输入这个（包括 obj_asset 到 FROM）：

(SELECT parent_id FROM object_object, obj_asset  WHERE object_object.object_id = obj_asset.object_id )

但不是这个：

(SELECT parent_id from object_object WHERE object_id = obj_asset.object_id )
于 2011-02-07T21:20:22.640 回答