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copied!<p>Try a PERSISTED COMPUTED column: <a href="http://msdn.microsoft.com/en-us/library/ms191250.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms191250.aspx</a> (might need an outer cast here)</p> <pre><code>Location_Geography AS ( CASE WHEN Location_Latitude <> 0 AND Location_Longitude <> 0 THEN geography::STGeomFromText('POINT(' + CONVERT(VARCHAR(100),Location_Longitude) + ' ' + CONVERT(VARCHAR(100),Location_Latitude) + ')',4326) ELSE NULL END ) </code></pre> <p>This avoids having to make a trigger with pretty much the same overall effect.</p> <p>Triggers: <a href="http://msdn.microsoft.com/en-us/library/ms191524.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms191524.aspx</a></p> <p>Your trigger could probably be modified as:</p> <pre><code>CREATE TRIGGER Update_Geography ON [People] FOR INSERT, UPDATE AS BEGIN UPDATE [People] SET Location_Geography = geography::STGeomFromText('POINT(' + CONVERT(VARCHAR(100),Location_Longitude) + ' ' + CONVERT(VARCHAR(100),Location_Latitude) + ')',4326) WHERE (UPDATE(Location_Longitude) OR UPDATE(Location_Latitude)) AND Id IN (SELECT ins.Id FROM inserted ins) END END </code></pre> <p>Here's an example showing both manual and calc'ed columns:</p> <pre><code>IF EXISTS ( SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[SO5572806]') AND type IN (N'U') ) DROP TABLE [dbo].[SO5572806] GO CREATE TABLE SO5572806 ( lo DECIMAL(8, 5) NOT NULL ,la DECIMAL(8, 5) NOT NULL ,man GEOGRAPHY NULL ,calc AS (CONVERT(GEOGRAPHY, CASE WHEN la <> 0 AND lo <> 0 THEN GEOGRAPHY::STGeomFromText('POINT(' + CONVERT(VARCHAR, lo) + ' ' + CONVERT(VARCHAR, la) + ')', 4326) ELSE NULL END)) ) GO INSERT INTO dbo.SO5572806 (lo, la) VALUES (0, 0), (-90, 30) UPDATE dbo.SO5572806 SET man = GEOGRAPHY::STGeomFromText('POINT(' + CONVERT(VARCHAR, lo) + ' ' + CONVERT(VARCHAR, la) + ')', 4326) WHERE lo <> 0 AND la <> 0 SELECT * FROM dbo.SO5572806 </code></pre>

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