Help Needed in Calculation

Question

Hi,
I have zip code database and i am trying to get the records based on 100/80/60/40 miles radius.
I Google through and got couple of article explains about using Haversine Formula. Also, following link has a function to calculate the distance.
[url=http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=81360][/url]
seems, this article/function build before the sqlserver 2008 born. Is there any better way to achieve this? 
Below the sample structure of my table.
Create table ZipCodes(ID bigint primary key identity(1,1),ZipCode varchar(10),
Address varchar(4000), city varchar(50),state varchar(50),Latitude float,Longitude float)
Create table Mall_Sores(StoreId bigint primary key identity(1,1),StoreName varchar(50),ZipCode varchar(10),
Address varchar(4000), city varchar(50),state varchar(50))
Mall_Sores table has 1 million records. If i pass '10001' as zip i need to look at 20 mile radius of the zipcode and list out the store names.
Any sample will be very appreciated.
loving dotnet

Answer 1

Have a look at the GEOGRAPHY data type.
Because you have the LAT and LONG, you can easily create a calculated column which then has a point object of the geography data type.   You can then use the native functions to join the tables based on the distance being less than a specified
value.
This requires SQL Server 2008 or later.
Check out this article to create the point data type :
http://www.sql-server-helper.com/sql-server-2008/convert-latitude-longitude-to-geography-point.aspx