Should have been search On Tue, Apr 14, 2020 at 5:33 PM John J Foster via 4D_Tech < [email protected]> wrote:
> Hey Chuck, > > Not sure what “hash and stir” means? > > Matching data requires one kind of index for speed and doing a radial > search another. > > In the db where I only have 1/2 million records with longitude as a real > the index returns a range quite quickly. So I’ll keep it for the radial > search. > > For matching the data the jury is still out. > > Appreciate, > John… > > > > Sure you hash and stir that, when searching for a particular lat/long > combination you has entry and search > > > > This will not help in distance calculations > > > > How about this for a create a concatenated key that has two parts for > each > > > > Named LatKey > > Lat_before decimal > > Lat_after decimal > > > > LongKey > > Long_before decimal > > long_after decimal > > > > do queries > > and process using fields that contain the entire lat and long as a real > > > > Regards > > > > Chuck > > ********************************************************************** > 4D Internet Users Group (4D iNUG) > Archive: http://lists.4d.com/archives.html > Options: https://lists.4d.com/mailman/options/4d_tech > Unsub: mailto:[email protected] > ********************************************************************** -- ----------------------------------------------------------------------------------------- Chuck Miller Voice: (617) 739-0306 Fax: (617) 232-1064 Informed Solutions, Inc. Brookline, MA 02446 USA Registered 4D Developer Providers of 4D, Sybase & SQL Server connectivity https://www.informed-solutions.com ----------------------------------------------------------------------------------------- This message and any attached documents contain information which may be confidential, subject to privilege or exempt from disclosure under applicable law. These materials are intended only for the use of the intended recipient. If you are not the intended recipient of this transmission, you are hereby notified that any distribution, disclosure, printing, copying, storage, modification or the taking of any action in reliance upon this transmission is strictly prohibited. Delivery of this message to any person other than the intended recipient shall not compromise or waive such confidentiality, privilege or exemption from disclosure as to this communication. ********************************************************************** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:[email protected] **********************************************************************
