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Returning record from History Table as it would have existed at a specific date/time

Posted By:      Posted Date: October 28, 2010    Points: 0   Category :Sql Server

I have a table that uses a trigger to save changes (old values) to a history table. This process is working fine, and I have reports that detail the history of a record for the end user. My problem is that the end user now wants a report that will retrieve how the record looked at a specific date/time.

Source Table:

Id	First	Last	Active	Date
1	John	Doe	1	10/25/2010
2	Jane	Smith	1	10/25/2010

History Table:

Id	SourceId	First		Last	Active	Date
1	1		Jonathon	NULL	NULL	5/1/2000
2	2		NULL		Gray	NULL	10/1/2000
3	2		NULL		Smith	NULL	6/15/2003
4	2		NULL		Doe	NULL	11/23/2008

If the user queries for SourceId 2 on 1/1/2009, they need to get:

Id	First	Last	Active
2	Jane	Smith	1

I've used COALESCE searching multiple fields, but I need to figure out how to

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