New Post: ROW_NUMBER OVER clause issue

 if @OrderBy=''
    begin
        set @SQL = @SQL + ' order by PL.Manufacturer,P.ProductRef'
    end

 if (@OrderBy <> 'man' AND @OrderBy <> 'ref' AND @OrderBy <>'name' AND @OrderBy <> 'price' AND @OrderBy <> 'cdate')
       begin
        set @SQL = @SQL + ' order by PL.Manufacturer,P.ProductRef'
    end