Having read up on RTrees I may have a problem - my primary key would not be unique :(
On 5 July 2013 12:05, Paul Sanderson <sandersonforens...@gmail.com> wrote: > Thanks for that Igor - I had RTree in the back of my mine but couldn't > remember what or where I had read about it. > > before I compile a dll (or someone provides a link to a 32 bit dl with > RTree enabled) is RTree likely to be useful in the following scenario? > > Each look up will usually, but not always, be successful - i.e. about 90% > of the time a search will result in about 4 rows being returned the other > 10% of the time nothing will be found > > Just sitting down to look at Simons suggestions. > > > > > On 5 July 2013 01:47, Igor Tandetnik <i...@tandetnik.org> wrote: > >> On 7/4/2013 5:29 PM, Paul Sanderson wrote: >> >>> select * from master as m, lookup as l where x >= start and and x < end >>> and >>> m.index = l.index >>> >> >> You might want to look at the RTree module: >> >> http://www.sqlite.org/rtree.**html <http://www.sqlite.org/rtree.html> >> >> It's specifically designed to implement such range queries efficiently. >> -- >> Igor Tandetnik >> >> >> ______________________________**_________________ >> sqlite-users mailing list >> sqlite-users@sqlite.org >> http://sqlite.org:8080/cgi-**bin/mailman/listinfo/sqlite-**users<http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users> >> > > > > > -- Paul www.sandersonforensics.com skype: r3scue193 twitter: @sandersonforens Tel +44 (0)1326 572786 http://sandersonforensics.com/forum/content.php?168-Reconnoitre - VSC processing made easy _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
