How to use alias column name in where clause in SQL Server

Question

When I tried to perform the below code in SQL Server 2005 I am getting the error

Invalid column name DistanceFromAddress

Code:<

Answer 1

I think you can only use AS to display the final values. To do a comparision, the select should be returned from another select statement inside it.

Like:

SELECT a.disfromaddr FROM
 ( SELECT SQRT(POWER(cast(Program_Latitude as float) - cast('41.5126237' as float), 2) +   
 POWER(cast(Program_Longitude as float) - cast('-81.6516411' as float), 2)) * 62.1371192 
 AS DistanceFromAddress FROM tblProgram) 
a WHERE a.disfromaddr < 2

You can try this.