Hi Andy,
This seemed to work:
MINUS { ?n0 ub:teacherOf <http://www.Department0.University0.edu/Course38> .
<http://www.Department0.University0.edu/AssistantProfessor0> ub:teacherOf
?n1 . }
The FILTER you came up with occurred to me, but the purpose of these queries
with MINUS in them were for my own discovery with the MINUS construct. That
BIND() is bizarre but cool too :-)
________________________________
From: Andy Seaborne <[email protected]>
To: [email protected]
Sent: Fri, May 6, 2011 2:58:10 PM
Subject: Re: query where distinct and minus have no effect
On 06/05/11 21:33, Damian Steer wrote:
> Hi Tim,
>
> Sorry, still on my phone so this is from memory: your MINUS doesn't bind
>anything, so nothing will be removed. You could FILTER out that result?
Spot on.
FILTER NOT EXISTS might be what you want.
although still you need to binding something in right hand side.
or simply
FILTER(?n0 !=
<http://www.Department0.University0.edu/AssistantProfessor0> && ?n1 !=
<http://www.Department0.University0.edu/Course38> )
MINUS removes rows on the left depending on whether they they are
compatible and share a common variable with rows on the right.
...
MINUS
{ BIND(<http://www.Department0.University0.edu/AssistantProfessor0> AS ?n0
BIND(<http://www.Department0.University0.edu/Course38> AS ?n1)
}
is a quite bizarre way of doing it.
Andy
>
> Damian
>
> Sent from my iPhone
>
> On 6 May 2011, at 20:42, Tim Harsch<[email protected]> wrote:
>
>> oops should have looked closer. The DISTINCT is not violated. Question
>> remains about MINUS.
>>
>>
>>
>>
>> ________________________________
>> From: Tim Harsch<[email protected]>
>> To: JENA-USERS<[email protected]>
>> Sent: Fri, May 6, 2011 12:31:11 PM
>> Subject: query where distinct and minus have no effect
>>
>> Hi,
>> Using the LUBM0 dataset I tried the following query in Fuseki-0.1.0.
>>
>> PREFIX ub:<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#>
>> SELECT DISTINCT *
>> WHERE {
>> ?n0 ub:teacherOf ?n1.
>> MINUS {<http://www.Department0.University0.edu/AssistantProfessor0>
>> ub:teacherOf<http://www.Department0.University0.edu/Course38> }
>> } ORDER BY ?n0 ?n1
>>
>> The first three results are below. Notice the first result contains
>> AssistantProfessor0, Course38 (violating the MINUS) and the next two results
>>are
>>
>> redundant (shouldn't happen with DISTINCT). Any ideas? The NT file can be
>> found in this Zip archive I packed up for other reasons (
http://bit.ly/k8adNJ
>> ).
>>
>>
>> <result>
>> <binding name="n0">
>> http://www.Department0.University0.edu/AssistantProfessor0
>> </binding>
>> <binding name="n1">
>> http://www.Department0.University0.edu/Course38
>> </binding>
>> </result>
>> <result>
>> <binding name="n0">
>> http://www.Department0.University0.edu/AssistantProfessor0
>> </binding>
>> <binding name="n1">
>> http://www.Department0.University0.edu/Course39
>> </binding>
>> </result>
>> <result>
>> <binding name="n0">
>> http://www.Department0.University0.edu/AssistantProfessor0
>> </binding>
>> <binding name="n1">
>> http://www.Department0.University0.edu/GraduateCourse39
>> </binding>
>> </result>
