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

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You can’t use aliased columns in a WHERE clause. You can try using a derived table. Perhaps something like this (sorry, not tested):

SELECT * 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) mytable
WHERE DistanceFromAddress < 2

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