radius search by latitude / longitude

Question

I have found a bunch of answers for this question using mysql , but I wasn\'t able to convert anything into a query ms sql 2008 can use. I have a longitude and latitude col

Answer 1

Since you're on SQL 2008, consider using the native geospatial capabilities. You can do fancy things like:

• Create a persisted computed column of geography type that represents your point.
• Create a spatial index on the computed column. This will make things like yourPoint.STDistance(@otherPoint) <= @distance efficient

Like so:

alter table [yourTable] add [p] as geography::Point(Latitude, Longitude, 4326) persisted;
create spatial index [yourSpatialIndex] on [yourTable] ([p])

declare @Latitude float = , @Longitude float = ;
declare @point geography = geography::Point(@Latitude, @Longitude, 4326);
declare @distance int = ;

select * from [yourTable] where @point.STDistance([p]) <= @distance;