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 :)