Question

I have the following stored procedure which returns A, B, and the count in descending order. I am trying to use ROW_NUMBER, so I can page the records, but I want the first row number 1 to be the record with the highest count, so basically, if I return a table with 3 records and the count is 30, 20, 10, then row number 1 should correspond with count 30, row number 2 should correspond with count 20, and row number 3 should correspond with count 10. dbo.f_GetCount is a function that returns a count.

create procedure dbo.Test as @A nvarchar(300) = NULL, @B nvarchar(10) = NULL as  select @A = nullif(@A,'')       ,@B = nullif(@B,'');  select h.A       ,hrl.B       ,dbo.f_GetCount(hrl.A,h.B) as cnt from dbo.hrl     inner join dbo.h         on h.C = hrl.C where(@A is null       or h.A like '%'+@A+'%'      )      and (@B is null           or hrl.B = @B          ) group by hrl.B         ,h.A order by cnt desc; 

Answer 1

WITH q AS         (         SELECT h.A, hrl.B,               dbo.f_GetCount(hrl.A,h.B) as cnt         FROM dbo.hrl         INNER JOIN dbo.h on h.C = hrl.C         WHERE (@A IS NULL OR h.A like '%' + @A + '%')            AND (@B IS NULL OR hrl.B = @B)         GROUP BY hrl.B, h.A         ) SELECT  q.*, ROW_NUMBER() OVER (ORDER BY cnt DESC) AS rn FROM    q ORDER BY rn DESC 

To retrieve first 10 rows, use:

WITH q AS         (         SELECT h.A, hrl.B,               dbo.f_GetCount(hrl.A,h.B) as cnt         FROM dbo.hrl         INNER JOIN dbo.h on h.C = hrl.C         WHERE (@A IS NULL OR h.A like '%' + @A + '%')            AND (@B IS NULL OR hrl.B = @B)         GROUP BY hrl.B, h.A         ) SELECT  TOP 10 q.*,          ROW_NUMBER() OVER (ORDER BY cnt DESC, A, B) AS rn FROM    q ORDER BY cnt DESC, A, B 

To retrieve rows between 11 and 20, use:

SELECT  * FROM    (         WITH q AS                 (                 SELECT h.A, hrl.B,                       dbo.f_GetCount(hrl.A,h.B) as cnt                 FROM dbo.hrl                 INNER JOIN dbo.h on h.C = hrl.C                 WHERE (@A IS NULL OR h.A like '%' + @A + '%')                    AND (@B IS NULL OR hrl.B = @B)                 GROUP BY hrl.B, h.A                 )         SELECT  q.*,                  ROW_NUMBER() OVER (ORDER BY cnt DESC, A, B) AS rn         FROM    q         ) qq WHERE rn BETWEEN 11 AND 20 ORDER BY cnt DESC, A, B