Question

Following is a Paging enabled Query for SQL server, it is working well without dynamic order by @pOrderBy variable .

I want to implement two things in this query.

1. I want to sort the rows according to the column name i m passing.

2. I want to run another Query in it to get total number of rows so that I can display number of pages on my UI.

   ALTER PROCEDURE [dbo].[usp_get_all_groups] 
     -- Add the parameters for the stored procedure here
     @pStartIndex smallint,
     @pPageSize tinyint,
     @pOrderBy varchar(20)
   AS
   BEGIN
     -- SET NOCOUNT ON added to prevent extra result sets from
     -- interfering with SELECT statements.
     SET NOCOUNT ON;
   
    SELECT       GroupTable._id,
                 GroupTable.GroupCode,
                 GroupTable.Type,
                 GroupTable.Description
       From(
       Select ROW_NUMBER() OVER (
          ORDER BY UG._id,
               UG.GroupCode,
               UG.Type,
               UG.Description ) as [Row_Number],
               UG._id,
               UG.GroupCode,
               UG.Type,
               UG.Description
      From UserGroups as UG
      ) as GroupTable
      where GroupTable.[Row_Number] BETWEEN @pStartIndex AND @pStartIndex + @pPageSize             
      ORDER BY GroupTable.[Row_Number]
   
   END
   

Answer 1

I want to sort the rows according to the column name i m passing.

You will need to use dynamic SQL for that – it is not possible to use a column name in a variable on a regular query.

An alternative is to use CASE in the ORDER BY clause – checking the value of the variable and using the corresponding column. See the comment from @Dems.

I want to run another Query in it to get total number of rows so that I can display number of pages on my UI.

Use an output parameter or return value and assign the value of such a query to it in this stored procedure.