Select coordinates which fall within a radius of a central point?
I have a database of coordinates in the schema:
I’ve set up my google maps application to show the markers effectively on the screen. However I need to add another feature whereby the user can view all pointers that fall within the radius from a central point.
How would I write up a sql statement of the kind:
Select all pointers that fall within a 10 mile radius of X & Y
The SQL below should work:
SELECT*FROM Table1 a WHERE( acos(sin(a.Latitude *0.0175)* sin(YOUR_LATITUDE_X *0.0175)+ cos(a.Latitude *0.0175)* cos(YOUR_LATITUDE_X *0.0175)* cos((YOUR_LONGITUDE_Y *0.0175)-(a.Longitude *0.0175)))*3959<= YOUR_RADIUS_INMILES )