Track Field Change SQL 2008

This one should be easy. I've done a fair bit of dabbling in SQL with standard statements (select, insert...), views, and even a stored proc or 2, but now I need a bit more.

What I need is to watch a field in a table, any time that changes write an insert into another table with that effective date.

Our front office system doesn't track a Vehicle's cost center effective date, so I thought I could use a trigger to do it myself. The destination table is stupid simple 2 fields, Unit and a datetime stamp. I just have never done this before and don't know where to start.  I find database triggers under Programmability in Management studio, but when I right click I don't get an option for new.

We are on SQL 2005.
bhiebAsked:
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Brian CroweDatabase AdministratorCommented:
Aircode so take with a grain of salt...

CREATE TRIGGER ON SourceTable
AFTER INSERT, UPDATE
AS
BEGIN

INSERT INTO DestinationTable (Unit, DateTimeStamp)
SELECT I.Unit, GETDATE()
FROM Inserted AS I
LEFT OUTER JOIN deleted AS D
   ON I.SourceTableKey = D.SourceTableKey
WHERE D.SourceTableKey IS NULL   -- An insert was made so no deleted table exists
   OR I.Unit <> D.Unit                         -- An update was made so just check that the specific column was changed

END

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bhiebAuthor Commented:
Thanks. I had to tweak it some but works great.
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