This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | |||
|
admin:features:geo:indexing [2011/04/13 03:30] 127.0.0.1 external edit |
admin:features:geo:indexing [2012/02/22 23:47] doc |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| ~~NOTOC~~ | ~~NOTOC~~ | ||
| + | |||
| {{page>:top_add&nofooter&noeditbtn}} | {{page>:top_add&nofooter&noeditbtn}} | ||
| Line 54: | Line 55: | ||
| ==== Indexing Geographic Coordinates ==== | ==== Indexing Geographic Coordinates ==== | ||
| - | Geographic coordinates are indexed in a multi-column Omnidex index containing first the latitude and then the longitude. This index will then be available for use in optimizing the [[dev:sql:functions:distance|$DISTANCE function]] in SQL SELECT statements. | + | Geographic coordinates are indexed in a multi-column Omnidex index containing first the **longitude and then the latitude**. This index will then be available for use in optimizing the [[dev:sql:functions:distance|$DISTANCE function]] in SQL SELECT statements. |
| <code sql> | <code sql> | ||
| Line 71: | Line 72: | ||
| "AREACODES" CHARACTER(15), | "AREACODES" CHARACTER(15), | ||
| "TIME_ZONE" TINYINT, | "TIME_ZONE" TINYINT, | ||
| - | omnidex "LATLONG" ("LATITUDE", "LONGITUDE"), | + | omnidex "LONGLAT" ("LONGITUDE", "LATITUDE"), |
| ) | ) | ||
| in "star.xml"; | in "star.xml"; | ||