I'm in the midst of the age-old problem of finding the right SQL to make a Dealer Locator by ZIP code. Like Steffan's posts from a couple weeks ago, I have the ZIP code data in one table with latitudes and longitudes, and the table of Dealers with ZIP codes in a separate table.

While researching this I came across a reference to MySQL's Spatial Extensions:
http://dev.mysql.com/doc/refman/5.0/en/spatial-extensions-in-mysql.html

This is WAY over my head. The reference I found said these extensions are "immature". I'm not even exactly sure what an extension is: does it mean that my ISP (PowWeb) probably doesn't have it installed?

Has anyone else who has tackled this application found the Spatial Extensions to be useful, or is it better to stick with the basics and go the route discussed in Steffan's recent thread?

- Brian

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