Thanks a lot for your answer. By the way, is there any extension needed to
run sub-queries?
Marcelo.
2012/11/9 Markus Krötzsch <mar...@semantic-mediawiki.org>
> On 09/11/12 09:37, Yury Katkov wrote:
>
>> Well you can also use template format if you don't like subqueries... It
>> would also help you to use the intermediate results.
>>
>
> That would let you "see" the intermediate results (otherwise, there is no
> way to find out which of, say, the "has C" values was "responsible" for
> having a line in the result). If you really need this, and the information
> cannot be retrieved later (e.g. if you know that there is only one "has C"
> on any page anyway), then templates might help.
>
> However, using templates with queries to format other queries is generally
> a bad approach that is extremely inefficient and will use a lot of memory
> and CPU to display a page (results are fetched from the database, rendered
> as wikitext, re-parsed as queries, which are used to fetch more results,
> ...); it will only work at all of your inner results are very limited in
> number.
>
> Markus
>
>
>>
>>
>> On Wed, Nov 7, 2012 at 5:44 PM, Marcelo Chiaradía
>> <chiaradiamarc...@gmail.com
>> <mailto:chiaradiamarcelo@**gmail.com<chiaradiamarc...@gmail.com>>>
>> wrote:
>>
>> Hi everyone,
>>
>> I'm trying to make an #ask query, using intermediates results to do
>> more queries within.
>>
>> I have this scenario:
>>
>> I have several pages of a category A. Some of them are related to
>> other pages of category B, through a "has B" property. Then, my B
>> pages are related to pages of category C, through "has C" property,
>> and finally my C pages have an attribute "att1", through "has att1"
>> property, wich has defined a specific set of values.
>>
>> I would like to make an "ask" query, asking for all my A pages,
>> whose must have at least one B page, which must have at least one C
>> page, and which must have the "att1 = SOME_VALUE", where some value
>> should be a parameter.
>>
>> I read about subqueries, doing something like:
>>
>> {{#ask: [[Category::A]] [[has B::<q>[[Category::B]] [[has C::
>>
>> <q>[[Category::C]] [[has att1::{{SOME_VALUE}}]]</q>]]
>> </q>]]
>> |?att1
>> }}
>>
>> Is this the right way to do this? is there a more elegant way?
>>
>> One other thing, I would like that if the user doesn't complete the
>> "SOME_VALUE" parameter, then return all the pages of category A. I
>> tried this with the "+" and "*" characters, but didnt work. How is
>> the best way to achieve this?
>>
>> Thanks a lot in advance,
>>
>> Marcelo.
>>
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