Aggregate adjacent only records with T-SQL

Question

I have (simplified for the example) a table with the following data

Row Start       Finish       ID  Amount
--- ---------   ----------   --  ------
  1 2008-         


        

Answer 1

Probably need to create a cursor and loop through the results, keeping track of which id you are working with and accumulating the data along the way. When the id changes you can insert the accumulated data into a temporary table and return the table at the end of the procedure (select all from it). A table-based function might be better as you can then just insert into the return table as you go along.