不可能制定复杂的查询? [英] What is it impossible to formulate complex queries?

问题描述

你好，

我正在做一个数据提取项目.
我想我不明白这一点，因为我不是数据库开发人员:)
我从一篇有关数据提取的论文中获得了下面的段落.
我的问题是:为什么不能进行受限(复杂)查询?
为什么不可能提出这样的查询?
在我看来，这并不是一件小事:(
我看到查询的方式是:无论多么复杂，您都可以制定任何查询.

想象一下您想监视有趣的eBay
提供(www.ebay.com)的笔记本，其中有趣的是
例如，要约由拍卖项目定义
其中包含单词\ notebook，具有当前值
介于1500和3000之间，且已在
收到 到目前为止，至少有3个出价. eBay网站不提供
制定此类复杂查询的可能性.相似
网站甚至没有提供受限的查询可能性，并且
留下大量整理的结果记录
在一个巨大的表格中，该表格分散在许多网页上.你
必须手动检查所有这些记录，因为
无法进一步限制结果.

预先感谢:)

Hello,

I am working on a data extraction project.
I think I don’t understand this because I am not a database developer :)
I got the paragraph below from a paper on data extraction.
My question is: why is it not possible to have restricted (complex) queries?
Why is it impossible to formulate such queries?
It does not look trivial to me :(
The way I see queries is: You can formulate any query, no matter how complex it is.

Imagine you would like to monitor interesting eBay
offers (www.ebay.com) of notebooks, where an interesting
offer is, for example, defined by an auction item
which contains the word \notebook", has current value
between gbp 1500 and 3000 and which has received at
least three bids so far. The eBay site does not offer the
possibility to formulate such complex queries. Similar
sites do not even give restricted query possibilities and
leave you with a large number of result records organised
in a huge table split over many web pages. You
have to wade through all these records manually, because
of no possibility to further restrict the result.

Thanks in advance :)

推荐答案

提出这样的查询并非并非不可能，但是设计一个允许非技术人员使用的用户界面非常困难.构造它们，而不会吓坏eBay普通用户使用的傻瓜.

想想看:Google允许您通过高级搜索，"+"和-"前缀，"site:"定义，"Define:"等来执行其中的一些操作，但由于它很难实现普通用户".

It isn''t impossible to formulate such queries, but it is very difficult to design a user interface that allows non-technical people to construct them, without scaring off the idiots that will by any old tat on eBay average eBay user.

Think about it: Google lets you do some of this, with Advanced searches, and "+" and "-" prefixes, "site:" definitions, "Define:" etc., but it is not advertised because it is hard for "normal users" to understand.

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