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QuestionHaving a bad SQL day Pin
TheComputerMan12-Feb-13 23:40
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I am sure I am overlooking something very simple but I can't see it.

I have a database of locations with latitudes and longitudes. I need to be able to query for locations that fall within a given radius from a lat/lon point

The code I am intending to use is: (Showing fixed centre 38,-118 in this version)

SELECT quakeid, (6371 * acos(cos(radians(38)) * cos(radians(latitude)) * cos(radians(longitude) - radians(-118)) + sin(radians(38)) * sin(radians(latitude)))) AS [dkm] 
FROM tblUSGSData 

(Derived from Creating a store locator[^])

This works fine and returns just over half a million entries.

My problem is that as soon as I add

HAVING [dkm] <= 50

or

WHERE [dkm] <= 50

I get the message

Msg 207, Level 16, State 1, Line 3
Invalid column name 'dkm'.

I obviously have not got my SQL glasses on today as I can't seem to resolve this. Can any one make (polite) suggestions?
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