How do you Select TOP x but still get a COUNT of the whole query?

Question

I\'m writing a webpage to interactively filter results based on filter criteria as it is specified by the user. I only want to return from SQL the TOP 20 rows but I want to

Answer 1

select COUNT(*) from Process_Master where dt_time=(select top 1 (dt_time) from Process_Master order by DT_TIME desc)

Answer 2

You can use COUNT(*) OVER()

SELECT TOP 20 *, 
       COUNT(*) OVER() AS TotalMatchingRows
FROM master..spt_values
WHERE type='P'
ORDER BY number

Doing two queries may work out more efficient however especially if you have narrower indexes that can be used in determining the matching row count but don't cover the entire SELECT list.