select the TOP N rows from a table

Question

I am making some paging, and I need to make some query and get the result form defined slicing . for example: I need to get all \"top\" rows in range 20n < x < 40n et

Answer 1

From SQL Server 2012 you can use a native pagination in order to have semplicity and best performance:

https://docs.microsoft.com/en-us/sql/t-sql/queries/select-order-by-clause-transact-sql?view=sql-server-ver15#using-offset-and-fetch-to-limit-the-rows-returned

Your query become:

SELECT * FROM Reflow  
WHERE ReflowProcessID = somenumber
ORDER BY ID DESC;
OFFSET 20 ROWS  
FETCH NEXT 20 ROWS ONLY;