>>Did you try having an index on the group by expression?
>>
>>Also, you do really need to convert to char? why not grouping by YEAR(Invoice.ModDate) directly? (and having an index on it too might help)
>
>In SQL Server you can not create an index on expression. Only if it's a computed column.
Oh, yes, little detail I forgot... sorry Michel! But still you do not need the convert in my opinion, although I already proved I could be wrong!
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