SQL Query-Group by and filters - sql

Question

I have the table as shown in below image.
I am trying to get the latest status_id, grouped by team_id and based on max of created_date.
--Latest status for each team based on created date
SELECT *
FROM ProductionHistory
WHERE created_Date IN (
SELECT MAX(created_Date)
FROM ProductionHistory
GROUP BY TeamID
)
That's fine, here is the result:
My questions are:
How to ignore the assigned_to null then find latest record for team?
When there is only one record with assigned_to null for team, let's consider that.
For example: for Team_id 5 there is only one record with assigned_to null, we don't have any other record for team_id 5 with assigned_to set some value.
So we have consider this.
For team id 3 query result should ignore the record 4 (though max date), query result should contain record 2.
Here is the final result I am expecting:

Answer 1

Try this:
DECLARE #t TABLE
(
TicketID INT ,
TeamID INT ,
StatusID INT ,
created_Date DATETIME ,
Assigned_to NVARCHAR(MAX)
)
INSERT #t
VALUES ( 10000, 2, 7, '2015-03-26 01:48:00.000', 'W3ER45' ),
( 10000, 3, 7, '2015-03-26 05:48:00.000', 'YU67IO' ),
( 10000, 2, 9, '2015-03-26 03:48:00.000', 'HJKO98' ),
( 10000, 3, 9, '2015-03-27 03:48:00.000', NULL ),
( 10000, 4, 11, '2015-03-23 03:48:00.000', 'GHR67' ),
( 10000, 5, 11, '2015-03-27 02:12:56.910', NULL );
;
WITH cte
AS ( SELECT * ,
ROW_NUMBER() OVER ( PARTITION BY TicketID, TeamID ORDER BY CASE
WHEN Assigned_to IS NULL
THEN 1
ELSE 0
END, created_Date DESC ) AS rn
FROM #t
)
SELECT TicketID ,
TeamID ,
StatusID ,
created_Date ,
Assigned_to
FROM cte
WHERE rn = 1
Output:
TicketID TeamID StatusID created_Date Assigned_to
10000 2 9 2015-03-26 03:48:00.000 HJKO98
10000 3 7 2015-03-26 05:48:00.000 YU67IO
10000 4 11 2015-03-23 03:48:00.000 GHR67
10000 5 11 2015-03-27 02:12:56.910 NULL

Answer 2

Try this answer.I did it with cursor
DECLARE #t TABLE ( TicketID INT
, TeamID INT
, StatusID INT
, created_Date DATETIME
, Assigned_to NVARCHAR(MAX) )
DECLARE cur CURSOR READ_ONLY FAST_FORWARD
FOR SELECT [TeamID]
FROM TT
DECLARE #i int
OPEN cur
FETCH NEXT FROM cur INTO #i
WHILE ##FETCH_STATUS=0
BEGIN
IF (SELECT COUNT_BIG([TeamID])
FROM TT
WHERE [TeamID]=#i)>1
BEGIN
INSERT INTO #T
SELECT TOP 1 *
FROM [dbo].[TT]
WHERE [TeamID]=#i AND [Assigned_to] IS NOT NULL
ORDER BY [created_Date] DESC
END
ELSE
BEGIN
INSERT INTO #T
SELECT *
FROM [dbo].[TT]
WHERE [TeamID]=#i
END
FETCH NEXT FROM cur INTO #i
END
SELECT TicketID
, TeamID
, StatusID
, Assigned_to
, created_Date
FROM #T
GROUP BY TicketID
, TeamID
, StatusID
, created_Date
, Assigned_to
CLOSE cur
DEALLOCATE cur