MS SQL pagination and grouping - sql-server

Question

I need help, because I'm struggling on how to page through and limiting that each page just show one process at a time. I have tried so many things and my brain got fried. Help........
So if the #PageNum = 1 and #Pagesize = 10 and if the first process has 7 rows; first page will show 7 rows of the first process (exactly what I want).
Now if the user chooses #PageNum = 2 and #Pagesize is 10 and the second process has 11. I want it to show the top 10 of this next process.
Currently it's showing only the last 8 of the second process.
I simplified the SQL to remove business information and then just to show the list of what I'm dealing with:
/*
notes:
Parameters passed in are #PageNum and #PageSize
#PageNum is which page they user goes to
#PageSize is the max number of rows to show
*/
DECLARE #StartRow int, #EndRow int
SET #StartRow = (#PageNum -1) * #PageSize +1;
SET #EndRow = #PageNum * #PageSize;
WITH ProcessestoPageThru AS
(Select Name,
ProcessId,
ROW_NUMBER() OVER(ORDER BY Name, ProcessId, ) as RowNo,
COUNT(Name) OVER() as RowCnt
from a whole bunch of tables
where a whole bunch of criteria
)
SELECT * INTO #tmp_ProcessestoPageThru
From ProcessestoPageThru
Where RowNo BETWEEN #StartRow AND #EndRow
Declare #ProcessID int
--Get the top ProcessID, We are only going to display one Process at a time
Select Top 1 #ProcessID = ProcessId
From #tmp_ProcessestoPageThru
Select *
from #tmp_ProcessestoPageThru
Where ProcessId = #ProcessId
Please see example attached:
Example

Answer 1

Try with other sample data.
If it is slow with real data then let me know with details.
i) you are only passing parameter like #Pageinde,#Pagesize apart from other search criteria.
ii)TotalPage is the number of pages that you get and have to ppolate your page accirdingly.forget the old calculation.
iii) rowcnt is not required.
declare #Pageindex int=1
declare #Pagesize int=10
declare #t table(processid int, rowcnt int)
insert into #t values(1,345),(1,345),(1,345),(1,345),(1,345),(1,345),(1,345)
,(1,345),(1,345),(1,345),(1,345),(1,345)
,(2,345),(2,345),(2,345),(2,345),(2,345),(2,345),(2,345),(2,345)
,(2,345),(2,345),(2,345),(3,345),(3,345)
;with CTE as
(
select *
,DENSE_RANK()over(order by processid) rownum
--,ROW_NUMBER()over(partition by processid order by processid) rownum1
,ROW_NUMBER()over(order by processid) rownum2
from #t
)
,CTE1 AS(
select *,
case when (rownum2/cast(#Pagesize as FLOAT))=1 then (rownum2/#Pagesize )
ELSE (rownum2/#Pagesize )+rownum END PageIndex
from cte c
)
select processid,rownum2
,(select max(PageIndex) from cte1) TotalPage
from cte1
where PageIndex=#Pageindex

Answer 2

You also need to do a PARTITION BY on ProcessId to display the results by that column value. Here is the code that may help you to do that.
;WITH ProcessestoPageThru AS
(
Select Name,
ProcessId,
ROW_NUMBER() OVER( PARTITION BY ProcessId ORDER BY Name, ProcessId ) as RowNo,
COUNT(Name) OVER() as RowCnt
FROM processes
)
SELECT Name,
ProcessId,
RowNo,
RowCnt
From ProcessestoPageThru
Where RowNo BETWEEN #StartRow AND #EndRow
AND ProcessId = #ProcessID