W3C home > Mailing lists > Public > public-rdf-dawg@w3.org > January to March 2005

GROUP BY [was: Comments list comments]

From: Dan Connolly <connolly@w3.org>
Date: Mon, 21 Mar 2005 10:53:57 -0600
To: "Seaborne, Andy" <andy.seaborne@hp.com>
Cc: RDF Data Access Working Group <public-rdf-dawg@w3.org>
Message-Id: <1111424037.8271.428.camel@localhost>

On Mon, 2005-03-21 at 16:04 +0000, Seaborne, Andy wrote:
> Matters arising from the comments list:
[...]
> 
> 2/ GROUP BY
> 
> Request for SQL-like GROUP BY in addition to ORDER BY.  GROUP BY allows the 
> application of aggrgeate functions which is more problematic than ORDER BY (that 
> only chnages the order of solutions, it does not remove, add or change 
> solutions).  It's use with aggregation functions like sum(), count() that is 
> tricky because of defining what is being counted (names or individuals).
> 
> COUNT() can lead to a significant decrease in network bandwidth but I have not 
> seen a proposal as to what it means for RDF query that explciitly addresses the 
> closed world assumptions.
> 
> 
> 	Andy

-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
D3C2 887B 0F92 6005 C541  0875 0F91 96DE 6E52 C29E
Received on Monday, 21 March 2005 17:00:05 GMT

This archive was generated by hypermail 2.3.1 : Tuesday, 26 March 2013 16:15:22 GMT