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Message Posted: Tue, 11 Nov 2008 @ 08:39:05 GMT

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Have you considered an installed_dte and a deinstalled_dte column, where the deinstalled_dte column is updated when a replacement part of the same partID replaces an existing part at a location? You could then calculate the interval dynamically in your sql for each part. You could set the current part's deinstalled_dte to null or a "high" date and separately calculate that part's installed interval.

Cheers,

Andy

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