Most efficient way to return the totalcount along with pagewise data [via pagenumber/pagesize as input]

Question

I have following query to return the page data
declare @pageSize INT = Null
,@pageNumber INT = Null
declare @totalcount int
set @pageSize =15
set @pageNumber = 1
select *
from (SELECT ROW_NUMBER()
OVER(
ORDER BY dbo.coordinator_event.CoordinatorId) AS RowNumberForPaging
,dbo.coordinator_event.EventId
,dbo.coordinator_event.NumberOfParticipantAllowed
,dbo.coordinator_event.RegistrationClosingDate
,dbo.coordinator_event.CoordinatorId
,dbo.royalevents_royalevent.title_en AS EventTitleEnglish
,dbo.royalevents_royalevent.StartDateTime
,Count(dbo.event_attendee_registration.FullName) ParticipantRegistration
, COUNT(*) OVER(PARTITION BY 1) as TotalRows
FROM dbo.coordinator_event
inner JOIN dbo.royalevents_royalevent
ON dbo.coordinator_event.EventId = dbo.royalevents_royalevent.base_id
left JOIN dbo.event_attendee_registration
ON dbo.coordinator_event.CoordinatorId = dbo.event_attendee_registration.CoordinatorId
and royalevents_royalevent.base_id = event_attendee_registration.EventId
where coordinator_event.CoordinatorId = 3
group by dbo.coordinator_event.EventId
,dbo.coordinator_event.NumberOfParticipantAllowed
,dbo.coordinator_event.RegistrationClosingDate
,dbo.coordinator_event.CoordinatorId
,dbo.royalevents_royalevent.title_en
,dbo.royalevents_royalevent.StartDateTime
) MyTable
WHERE RowNumberForPaging >= ( ( ( @pageSize * @pageNumber ) - @pageSize ) + 1 )
AND RowNumberForPaging <= ( @pageSize * @pageNumber )
ORDER BY CoordinatorId
I want's two thing with it. One thing is about how i can easily return @totalcount as separate parameter instead of part of the result set and secondly if there is a way i can optimize above row_number query to achieve paging
Kamran Shahid Application Developer (MCP,MCAD,MCSD.NET,MCTS,MCPD.net[web])

Answer 1

What is your SQL Server version?
I think there is no way to get the count except for using temp table, e.g.
select *
INTO #TempResults
from (SELECT ROW_NUMBER()
OVER(
ORDER BY dbo.coordinator_event.CoordinatorId) AS RowNumberForPaging
,dbo.coordinator_event.EventId
,dbo.coordinator_event.NumberOfParticipantAllowed
,dbo.coordinator_event.RegistrationClosingDate
,dbo.coordinator_event.CoordinatorId
,dbo.royalevents_royalevent.title_en AS EventTitleEnglish
,dbo.royalevents_royalevent.StartDateTime
,Count(dbo.event_attendee_registration.FullName) ParticipantRegistration
, COUNT(*) OVER(PARTITION BY 1) as TotalRows
FROM dbo.coordinator_event
inner JOIN dbo.royalevents_royalevent
ON dbo.coordinator_event.EventId = dbo.royalevents_royalevent.base_id
left JOIN dbo.event_attendee_registration
ON dbo.coordinator_event.CoordinatorId = dbo.event_attendee_registration.CoordinatorId
and royalevents_royalevent.base_id = event_attendee_registration.EventId
where coordinator_event.CoordinatorId = 3
group by dbo.coordinator_event.EventId
,dbo.coordinator_event.NumberOfParticipantAllowed
,dbo.coordinator_event.RegistrationClosingDate
,dbo.coordinator_event.CoordinatorId
,dbo.royalevents_royalevent.title_en
,dbo.royalevents_royalevent.StartDateTime
) MyTable
WHERE RowNumberForPaging >= ( ( ( @pageSize * @pageNumber ) - @pageSize ) + 1 )
AND RowNumberForPaging <= ( @pageSize * @pageNumber )
select @TotalCount = TotalRows from #TempResult
SELECT .. FROM #TempResult
ORDER BY CoordinatorId
See also this very recent article about the subject you ask:
Paging
a Query with SQL Server
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