Problem with updating multiple rows which are in conflict with unique index

Posted by GUZ on Stack Overflow See other posts from Stack Overflow or by GUZ
Published on 2010-04-07T14:22:52Z Indexed on 2010/04/07 20:23 UTC
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I am using Microsoft SQL Server and I have a master-detail scenario where I need to store the order of details. So in the Detail table I have ID, MasterID, Position and some other columns. There is also a unique index on MasterID and Position. It works OK except one case: when I have some existing details and I change their order. For example when I change a detail on position 3 with a detail on position 2. When I save the detail on position 2 (which in the database has Position equal to 3) SQL Server protests, because the index uniqueness constraint.

How to solve this problem in a reasonable way?

Thank you in advance
Lukasz Glaz

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