how i can count record by datetime group by day view per hours

Add DATEPART(hh, datetimein) to the grouping.

i have added it but i want to get a format like AM PM

can't test, but try this :

SELECT  count(0) as nMessages,  convert(nvarchar, datetimein, 103) as currDate, RIGHT(CONVERT(VARCHAR,datetimein, 100),7) as currHour 
FROM [radiomix].[dbo].[chat] 
GROUP BY convert(nvarchar, datetimein, 103), RIGHT(CONVERT(VARCHAR,datetimein, 100),7)

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If you are wanting to see the hours across the report, try this:

SELECT	reqport,
		SUM(CASE WHEN DATEPART(hh, datetimein) = 0 THEN 1 ELSE 0 END) AS 'Midnight', 
		SUM(CASE WHEN DATEPART(hh, datetimein) = 1 THEN 1 ELSE 0 END) AS '1:00 AM',
		SUM(CASE WHEN DATEPART(hh, datetimein) = 2 THEN 1 ELSE 0 END) AS '2:00 AM',
-- additional times here		
		SUM(CASE WHEN DATEPART(hh, datetimein) = 23 THEN 1 ELSE 0 END) AS '11:00 PM'
FROM	radiomix.dbo.chat
GROUP BY reqport,
		YEAR(datetimein),		
		MONTH(datetimein),		
		DAY(datetimein)

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It isn't the cleanest, and you may be able to play around and use the PIVOT function, but seeing as how your time (I'm sure) contains minutes and seconds, it would still take some work.

The above won't give you the date. Use

SELECT	reqport,
	CAST(datetimein AS DATE) AS Date,
	SUM(CASE WHEN DATEPART(hh, datetimein) = 0 THEN 1 ELSE 0 END) AS 'Midnight', 
	SUM(CASE WHEN DATEPART(hh, datetimein) = 1 THEN 1 ELSE 0 END) AS '1:00 AM',
	SUM(CASE WHEN DATEPART(hh, datetimein) = 2 THEN 1 ELSE 0 END) AS '2:00 AM',
-- additional times here		
	SUM(CASE WHEN DATEPART(hh, datetimein) = 23 THEN 1 ELSE 0 END) AS '11:00 PM'
FROM	dbo.chat
GROUP BY reqport,
	CAST(datetimein AS DATE)

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dbbishop
Msg 243, Level 16, State 1, Line 1
Type DATE is not a defined system type.
Msg 243, Level 16, State 1, Line 1
Type DATE is not a defined system type.

 sognoct your code now work :D

i want to count the message for example
MIDNIG. TO 1:00AM
1:00AM TO 2:00AM


TO

11:00PM TO 11:59PM

FOR EACH REQPORT

AND THE GROUP SHOULD BE

Are you using SQL Server 2008?

SELECT	reqport,
		YEAR(datetimein) as years,		
		MONTH(datetimein) as months,		
		DAY(datetimein) as days,
		SUM(CASE WHEN DATEPART(hh, datetimein) = 0 THEN 1 ELSE 0 END) AS 'Midnight', 
		SUM(CASE WHEN DATEPART(hh, datetimein) = 1 THEN 1 ELSE 0 END) AS '1:00 AM',
		SUM(CASE WHEN DATEPART(hh, datetimein) = 2 THEN 1 ELSE 0 END) AS '2:00 AM',
-- additional times here
	    SUM(CASE WHEN DATEPART(hh, datetimein) = 22 THEN 1 ELSE 0 END) AS '10:00 PM',		
		SUM(CASE WHEN DATEPART(hh, datetimein) = 23 THEN 1 ELSE 0 END) AS '11:00 PM'

FROM	radiomix.dbo.chat
GROUP BY reqport,
		YEAR(datetimein),		
		MONTH(datetimein),		
		DAY(datetimein)
ORDER BY
		YEAR(datetimein) DESC,		
		MONTH(datetimein) DESC,		
		DAY(datetimein) DESC
		

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