通过最大日期和特定ID查找并返回最新记录

Question

What I am trying to do list the most recent event type '1081'

But I am only getting a '1081' if its the most recent event type.

The other event type is '1009'

If 1009 is the most recent event type then the record does not appear at all.

If I search all event types then the number of records returned is correct.

I have manually checked through the records and each has an event type 1081 attached to it.

(The event type is matched to a comment that I want to display and I only want to display the most recent 1081 comment)

This is the code

SELECT
   o.SiteIdAndName,
   o.Id,
   r.callid,
   o.masterSymptom,
   o.subSymptom,
   o.received,
   o.closed,
   r.eventtype,
   r.datetime,
   r.loggedby,
   r.eventcomments,
   --o.lastedt,
   DATEDIFF(HOUR, received, COALESCE(closed, GETDATE())) AS 'HoursOpen'

FROM
   vw_UserView_OpenAndClosed2016 o
   LEFT JOIN dbo.tblcallev r ON r.callid = o.id --and r.eventtype = 1081

WHERE
   o.SchemeName = 'INDIS'
   AND o.SubSymptom = 'Care' 
   AND Closed is NULL
   AND r.datetime = (
   SELECT MAX(datetime)
   FROM dbo.tblcallevents
   WHERE NOT r.eventtype = 1009
   AND callid = r.callid
   )

Order by 
  r.eventtype

Can you help me at all?

Answer 1

I think this could be very straight foreword query, like below

SELECT TOP(1) *--column list here
FROM
vw_UserView_OpenAndClosed2016 o
INNER JOIN dbo.tblcallev r ON r.callid = o.id and r.eventtype = 1081
WHERE o.SchemeName = 'INDIS' AND o.SubSymptom = 'Care' AND Closed is NULL
ORDER BY r.datetime

Here ORDER BY r.datetime will sort data according to recent datetime values for r.eventtype = 1081

UPDATED :

;WITH CTE AS(
       SELECT *,
              ROW_NUMBER() OVER(PARTITION BY o.id ORDER BY r.datetime) RN  
       FROM
       vw_UserView_OpenAndClosed2016 o
       INNER JOIN dbo.tblcallev r ON r.callid = o.id and r.eventtype = 1081
       WHERE o.SchemeName = 'INDIS' AND o.SubSymptom = 'Care' AND Closed is NULL
)
SELECT * 
FROM CTE
WHERE RN=1