SQL Query for Performing Radius Search based on Latitude Longitude

Question

We have a restaurant table that has lat-long data for each row.

We need to write a query that performs a search to find all restaurants within the prov

Answer 1

If your data is in SQL server database, you can use this:

CREATE PROC up_FindZipCodesWithinRadius

    @ZipCode char(5) ,
    @GivenMileRadius int
AS
SET NOCOUNT ON

DECLARE @lat1 float, 
    @long1 float

SELECT  @lat1= latitude,
    @long1 = longitude 
FROM ZipSource
WHERE zipcode = @ZipCode

SELECT ZipCode ,DistanceInMiles
FROM
(
    SELECT  ZipCode,3958.75 * ( Atan(Sqrt(1 - power(((Sin(@Lat1/57.2958) * Sin(latitude/57.2958)) + 
            (Cos(@Lat1/57.2958) * Cos(latitude/57.2958) * Cos((longitude/57.2958) - (@Long1/57.2958)))), 2)) / 
            ((Sin(@Lat1/57.2958) * Sin(latitude/57.2958)) + (Cos(@Lat1/57.2958) * Cos(latitude/57.2958) * 
            Cos((longitude/57.2958) - (@Long1/57.2958)))))) as DistanceInMiles
FROM ZipSource
) a
WHERE a.DistanceInMiles <= @GivenMileRadius
--AND ZipCode <> @ZipCode
ORDER BY DistanceInMiles

GO

EXEC up_FindZipCodesWithinRadius '35085',20
GO

DROP PROC up_FindZipCodesWithinRadius