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Update with Join

Using Update Query with Join:

Assigning numbers in a sequence to the newly updated row:
Update dbo.EventDateTime
set dbo.EventDateTime.SessionNo = Num
from dbo.EventDateTime dd Inner Join(
select (rank() OVER (ORDER BY startDate , StartTime ))’Num’
,[SessionNo],EventDateTimeID
from dbo.EventDateTime
where [EventGroupNo] =@GroupID) as temp
on temp.EventDateTimeID = dd.EventDateTimeID

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