>>I need to update all duplicates by FK and Flag = 1 to set flag = 0 except for the latest by Date1 and Date2. I already did it by procedural code, but curious if it's possible to get the records to update by SQL.
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>Basically you will be updating your table using the PK from ..
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>selecting TOP 1 PK from (your duplicate selection statement) order by Date1 desc
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>and
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>selecting TOP 1 PK from (your duplicate selection statement) order by Date2 desc

Not exactly. I need to update all records which are duplicates except for the top 1. I guess in SQL Server you can use CTE to get all duplicates.

Still a bit tricky.