1件背景INF的：这是关于持有对象CMS - 客体关系及其在单表的排序，列OBJECT_ID，PARENT_ID和排序顺序需要帮助与MySQL查询

第二张有若干个连接查询，我想按2个参数排序。其中一个是对象本身的排序，第二个是父对象的排序顺序。

查询我有现在是：

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;

而且这是行不通的。这虽然能正常工作：

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 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 - 未知列'obj_asset.object_id 'where子句'

我怎样才能得到它的工作？

谢谢！

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

来源

2011-02-07 Odif Yltsaeb

你确定你已经在obj_asset表OBJECT_ID列？ – KomarSerjio 2011-02-07 21:12:58

错误信息在这个例子中是一个很好的线索。（如果解释器尝试使用错误的object_id字段，则可能必须使用`tablename.fieldname`命名样式。）:-) – 2011-02-07 21:14:14

@KomarSerjio - 是的，我 - 你可以看到，它不是唯一的地方，我使用相同的列和表，它的工作原理，如果我改变它的实际ID。 @middaparka - 我明白为什么会出现错误 - 在内部选择的上下文中，没有obj_asset.object_id，因为它尚未被选中......但是我怎样才能解决这个只有一个查询？ – 2011-02-07 21:18:00

正如你已经想通了，问题是，你正在尝试在子查询约束中使用外部查询中的列：

(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，b不知道如何只看你的原始查询。

有可能是你的原始查询错误（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;

任何不使用名为op子查询中加入或where子句。

我最好的猜测是，你想以下几点：

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;

来源

2011-02-07 21:47:23 marapet

您的子查询不在FROM子句中包含obj_asset。

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

让这部分运行，你应该有更好的运气与整个事情。

只是一个提示......如果你在你的SQL语句中添加更多的新行和缩进，你会更容易发现问题。

来源

2011-02-07 21:16:21 Nathan

meh？是的..我知道那是问题所在。我只是想不出有什么办法来修复它。 – 2011-02-07 21:25:07

我认为你需要键入这个（包括obj_asset从）：

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

但不是这样的：

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

来源

2011-02-07 21:20:22 SVGreg

需要帮助与MySQL查询

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

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