openRDF.org - View Thread - How Powerful is SPARQL???

Welcome Guest | Login

Forum has been closed down
This forum has been closed down due to extensive spamming activities. Please use the mailing list instead.

openRDF.org Forum » General: Other » Thread: How Powerful is SPARQL???

Thread Status: Normal
Total posts in this thread: 3

[Add To My Favorites] [Watch this Thread]

Author

This topic has been viewed 3676 times and has 2 replies

Sep 10, 2007 3:10:55 PM

Fergie
Visitor

Joined: Sep 10, 2007
Posts: 4
Status: Offline

How Powerful is SPARQL???

I have a question concerning SPARQL. Is it possible to do set operations, which I can do in SeRQL, in SPARQL? Such as UNION, INTERSECTION, MINUS ?

I give an SeRQL-Example:

SELECT cp
FROM {cp} rdf:type {ns5:Competency};
          ns5:isCompetencyOf {ns5:JobCompetencyProfile_04}

INTERSECT

SELECT cp
FROM {cp} rdf:type {ns5:Competency};
          ns5:isCompetencyOf {ns5:DummyProfile_01}

Is it possible the do this query in SPARQL?
Is there also an Existential Quantor?

Regards,
Fergie

[Link]

Sep 18, 2007 10:33:37 AM

arjohn
OpenRDF project lead

The Netherlands
Joined: Jan 23, 2004
Posts: 1289
Status: Offline

Re: How Powerful is SPARQL???

Currently, SPARQL can't do this. The only set operation that is supported by SPARQL is a (slightly different form of) UNION.
----------------------------------------
Arjohn Kampman, OpenRDF project lead, Aduna

[Link]

Mar 6, 2009 3:54:59 AM

mas7004
Visitor

Joined: Mar 6, 2009
Posts: 1
Status: Offline

Re: How Powerful is SPARQL???

Is there a work-around for implementing an INTERSECTION-like SPARQL query? Any simple examples with 2 graphs?

[Link]

[Show Printable Version of Thread]