OFFSET | FETCH Order By column - SQL Server

Question

Can anyone explain to me on a very basic level what the performance difference would be for these 2 queries.

ORDER BY (select null)
OFFSET @Offset ROWS
FETCH NEXT @EntriesPerPage ROWS ONLY;

ORDER BY (ItemID)
OFFSET @Offset ROWS
FETCH NEXT @EntriesPerPage ROWS ONLY;

I would expect the first query to perform better because it is not ordering by a column but every time i test this the second query always performs better. Can anyone explain to me why the second query would run better for OFFSET / FETCH even though it is ordering by a column.

I run the queries separately. I wipe the cache plan and buffers between each query so that it doesn't use the previous execution plan.

Thanks

Answer 1

是的，第一个查询应该运行得更快，因为第二个查询需要执行其他排序操作。

Answer 2

First query should be faster .

Did you try executing second query first and see the difference in performance. Might be indexing and other performance attributes makes you feel second query executes faster.