T-SQL (SS2K8) :: Grouping Of Data Based On Moving Time Period

To give you some context we have a new amendments application (nothing fancy, excel based with SQL Server back end) that allows users to submit amendments to product data (Product Info, PO Prices, Dates etc.). There is also an admin tool that a team uses to action these amendments in the various systems.

The old version of this tool, users submitted amendments by style and could if need be submit multiple amendments against one product at the same time. The new tool, I believe for audit reasons, users submit by amendment type, so for example I would submit a cost price change for a given style.

The issue now is that on the occasions where a user has multiple amendments, they now come through separately. So cost price would be Amendment 1 and a date change would be amendment 2 even though they could be the same product. This could potentially mean that the admin team would be duplicating work if the paperwork is updated and sent after each amendment, whereas before they would make both changes and only send the paperwork once.

Having not built either of these tools, I've been tasked with trying to fix this, my two thoughts being either to amend the user form to somehow capture/ allow users to submit amendments together or try to use the existing data and doing the grouping dynamically in the back end. Use that lag to look at grouping any submitted amendments that occur within 30mins of the first occurrence of that style

This grouping would then be given a joint time so when the 'time lag' period passes the amendments will be visible together.I've tried a few things and a few head on desk moments trying to get a set based approach but haven't been able to get where i want, its either an issue where amendments span an hour, such as 9:59 and then 10:03 or grouping together amendments that happen after the 30mins of the first one.

Here is some sample data

USE FF_Winning_Together;
IF OBJECT_ID(N'tempdb..#AmendTest',N'U') IS NOT NULL
DROP TABLE #AmendTest;
CREATE TABLE #AmendTest
(
AmendmentIDINT IDENTITY(1,1)NOT NULL,
StyleCHAR(1)NOT NULL,
AmendmentStatusVARCHAR(10)NOT NULL,
DTDATETIMENOT NULL

[code]....