- From: Richard Newman <r.newman@reading.ac.uk>
- Date: Sat, 25 Jun 2005 10:05:16 +0100
- To: Jan Algermissen <jalgermissen@topicmapping.com>
- Cc: Danny Ayers <danny.ayers@gmail.com>, semantic-web@w3.org
That would be my immediate approach, rather than having a mutating statement in the store... it also allows one to ask "who's presenting tomorrow at 10?" without any changes. Methinks a store perhaps needs specialised indices for datatypes to speed this kind of thing up. -R On 25 Jun 2005, at 09:30, Jan Algermissen wrote: > > Danny, > > why don;tyou just put the current time in the query? > > ..where presentation-start <= "2005-06-24T15:05:00Z" > and prtesenation-end == null > > (forgive me the SQL like query, not yet good enough at sparql). > > (This brings up an issue I have with existing RDF databases: all of > them seem > not to be able to recognize literal datatypes for operator > 'binding'. For > example: the <= operator should work differently for dates than for > int and yet > for strings). > > If you have a million+ dates, doing the <= operation with a full > scan is > starting to be rediculous. > > Thoughts? > > Jan
Received on Saturday, 25 June 2005 09:05:28 UTC