- From: Lee Feigenbaum <lee@thefigtrees.net>
- Date: Thu, 31 Jan 2008 11:27:48 -0500
- To: Rahul Patil <rahulpatil12@gmail.com>
- CC: public-sparql-dev@w3.org
Rahul Patil wrote: > Hi All, > > Rather a simple (may be stupid) SPARQL question. > Is it possible to get total number of results back for a SPARQL query; > without actually getting all the results back? like ASK tells if results > are present; Is there anything which tells how many of them are present? Hi Rahul, It's not a stupid question at all. SPARQL does not provide a standard way to do this (a la COUNT in SQL). However, many SPARQL implementations do extend the language with support for COUNT. Some examples include: ARQ (http://seaborne.blogspot.com/2007/09/counting-and-group-by.html) Virtuoso (http://docs.openlinksw.com/virtuoso/rdfsparqlaggregate.html) ARC (http://arc.semsol.org/docs/v2/sparql+) RAP (http://www.informatik.uni-leipzig.de/~auer/publication/sparql-enhancements.pdf) Glitter (http://www.thefigtrees.net/lee/blog/2007/10/announcing_open_anzo_25_releas.html) More generally, I'm working to add information on this and other common SPARQL extensions to the ESW Wiki and the SPARQL FAQ; I'll post here when I've done that. Lee
Received on Thursday, 31 January 2008 16:28:02 UTC